Identification, prevalence and pathogenicity of Colletotrichum species causing anthracnose of Capsicum annuum in Asia.

Anthracnose of chili (Capsicum spp.) causes major production losses throughout Asia where chili plants are grown. A total of 260 Colletotrichum isolates, associated with necrotic lesions of chili leaves and fruit were collected from chili producing areas of Indonesia, Malaysia, Sri Lanka, Thailand and Taiwan. Colletotrichum truncatum was the most commonly isolated species from infected chili fruit and was readily identified by its falcate spores and abundant setae in the necrotic lesions. The other isolates consisted of straight conidia (cylindrical and fusiform) which were difficult to differentiate to species based on morphological characters. Taxonomic analysis of these straight conidia isolates based on multi-gene phylogenetic analyses (ITS, gapdh, chs-1, act, tub2, his3, ApMat, gs) revealed a further seven known Colletotrichum species, C. endophyticum, C. fructicola, C. karsti, C. plurivorum, C. scovillei, C. siamense and C. tropicale. In addition, three novel species are also described as C. javanense, C. makassarense and C. tainanense, associated with anthracnose of chili fruit in West Java (Indonesia); Makassar, South Sulawesi (Indonesia); and Tainan (Taiwan), respectively. Colletotrichum siamense is reported for the first time causing anthracnose of Capsicum annuum in Indonesia and Sri Lanka. This is also the first report of C. fructicola causing anthracnose of chili in Taiwan and Thailand and C. plurivorum in Malaysia and Thailand. Of the species with straight conidia, C. scovillei (acutatum complex), was the most prevalent throughout the surveyed countries, except for Sri Lanka from where this species was not isolated. Colletotrichum siamense (gloeosporioides complex) was also common in Indonesia, Sri Lanka and Thailand. Pathogenicity tests on chili fruit showed that C. javanense and C. scovillei were highly aggressive, especially when inoculated on non-wounded fruit, compared to all other species. The existence of new, highly aggressive exotic species, such as C. javanense, poses a biosecurity risk to production in countries which do not have adequate quarantine regulations to restrict the entry of exotic pathogens.

INTRODUCTION

Colletotrichum is one of the most important genera of plant pathogenic fungi with many of the 200 plus species known to cause disease in plant crops worldwide (Udayanga et al. 2013; Marin-Felix et al. 2017). Colletotrichum species causing anthracnose are particularly important as post-harvest pathogens of fruit and vegetable crops growing in tropical and subtropical climates (Alahakoon et al. 1994; Rojas et al. 2010; Cannon et al. 2012; Damm et al. 2012a, 2012b; Udayanga et al. 2013; Shivas et al. 2016; De Silva et al. 2017a).

Chili (Capsicum spp.) is an important vegetable crop in tropical and subtropical climates and the fresh or dried fruit is a major culinary ingredient in many cuisines. Anthracnose is a major disease of chili fruit causing significant yield loss as well as reducing the marketability of the fruit. Anthracnose of chili has been shown to be caused by 24 Colletotrichum species (Mongkolporn and Taylor 2018) reported from many countries including Australia (De Silva et al. 2017a), Brazil (de Oliveira et al. 2017), China (Diao et al. 2017), India (Sharma and Shenoy 2014), Indonesia (Voorrips et al. 2004), Korea (Kim et al. 1999), Malaysia (Noor and Zakaria 2018), Sri Lanka (Ranathunge et al. 2009), Thailand (Than et al. 2008) and the USA (Harp et al. 2008).

Colletotrichum species causing anthracnose of chili in Asia were previously identified as C. acutatum (straight conidia with acute ends), C. gloeosporioides (straight conidia with obtuse ends) and C. truncatum (falcate conidia) (Than et al. 2008, Mongkolporn et al. 2010,). However, with the implementation of multigene phylogenetic analyses, C. acutatum was demonstrated to be a species complex (acutatum complex) composed of 34 closely related species (Marin-Felix et al. 2017), with seven species identified as causing anthracnose in chili (Mongkolporn and Taylor 2018). Similarly, C. gloeosporioides was shown to be a species complex of 38 closely related species (Marin-Felix et al. 2017), with nine species identified to cause anthracnose in chili (Mongkolporn and Taylor 2018). Morphological characters cannot differentiate many of the species with straight conidia, especially those in the acutatum and gloeosporioides complexes that are pathogens of chili, and thus multigene phylogenetic analyses are required for proper identification of these species (De Silva et al. 2017a).

The distribution of the Colletotrichum species that cause anthracnose of chili is quite variable across countries that produce this crop. For example, in Australia only six out of the 24 Colletotrichum pathogens of chili have been identified (De Silva et al. 2017a), in Thailand only three have been reported (Mongkolporn and Taylor 2018), and five from Malaysia (Noor and Zakaria 2018). In most of the previous reports the identification of species was based only on morphological data. Therefore, the status of the taxonomy of Colletotrichum spp. causing anthracnose in chili producing countries in Asia remains uncertain. Proper identification of these pathogens is important for mitigating the risk of incursion of new pathogens which if happens, may have devastating consequences for the local industries. In addition, accurate identification of the species is important for resistance breeding programs and in identifying the host-range of species. Several Colletotrichum species such as C. karsti, C. siamense and C. truncatum have broad host ranges (Cannon et al. 2012; Damm et al. 2012b). The main Colletotrichum species causing anthracnose in chili are known to be in the acutatum and gloeosporioides complexes. However, recently further species from the boninense and orchidearum complexes were implicated (Diao et al. 2017; Damm et al. 2019). Therefore, it is important to understand the taxonomy, diversity and pathogenicity of Colletotrichum species that infect chili and their distribution across countries.

The aims of the study were to (1) identify the Colletotrichum species with straight conidia (cylindrical and fusiform) causing anthracnose of chili in selected regions of Indonesia, Malaysia, Taiwan, Thailand and Sri Lanka, and (2) determine the pathogenicity of those species on chili.

MATERIALS AND METHODS

Isolates

A total of 260 isolates associated with anthracnose disease symptoms on chili fruit and leaves were collected from chili producing countries in Asia: Indonesia, Malaysia, Taiwan, Thailand, and Sri Lanka (Table 1). Type specimens and ex-type cultures are deposited in the Westerdijk Fungal Biodiversity Institute, Utrecht, The Netherlands (CBS), and in the University of Melbourne culture collection (UOM), Victoria, Australia.

Table 1

Collection sites and numbers of Colletotrichum isolates

Country and region	Number of isolates
Thailand	96
Chiang Mai	20
Chiang Rai	44
Kanchana Buri	4
Nakhon Pathom	7
Suphan Buri	12
Ratchaburi	7
Bangkok	2
Malaysia	12
Pahang	3
Johor	4
Kelantan	5
Sri Lanka	19
Kandy	5
Matara	14
Indonesia	113
Gowa	31
Soppeng	6
Jeneponto	45
Makassar	7
Maros	4
West Java (East West Seed Co. Indonesia)	20
Taiwan (World Vegetable Center collection)	20
Tainan	14
Taichung	1
Nantou	2
Pingtung	1
Ilan	1
Hsinchu	1

Figures in bold represent the total number of isolates from each country

Fungal isolates were established from lesions on infected fruit and leaves using two methods. Surface sterilised (~ 1% ai sodium hypochlorite for 5 min) infected tissue (0.5 cm2) was cultured on water agar (WA; Crous et al. 2009) and then after 2 to 3 d fungal hyphae were subcultured onto potato dextrose agar (PDA, Difco) and synthetic nutrient-poor agar (SNA, Nirenberg 1976) as described by De Silva et al. (2017a). Freshly collected fruit from field grown chili plants with typical anthracnose lesions was incubated for 1 to 2 d in a moist chamber until conidiomata appeared and then single spore isolation was performed according to Choi et al. (1999). Selected isolates were also cultured on oatmeal agar (OA; Crous et al. 2009) and malt extract agar (MEA) at 20 °C under near UV light with a 12 h photoperiod for 10 d. Cultures were isolated and maintained either at the AQIS quarantine laboratory at the University of Melbourne or the Evolutionary Pathology Laboratory at the Westerdijk Fungal Biodiversity Institute, Netherlands (CBS).

Morphology

Cultures grown on PDA at 27 °C were used for morphological analysis. Colony colour and texture were examined after 10 d, and colony growth rate calculated by measuring colony diameter 7 and 10 d after incubation.

Conidia from the conidiomata in culture were mounted in lactic acid and the length and width measured for 30 randomly selected conidia for each isolate, with the range and mean calculated. Size and shape of appressoria were determined on WA using a slide culture technique (Johnston and Jones 1997). Production of acervular conidiomata was observed on dried, sterilised chili peduncles inoculated with mycelia and incubated on WA and SNA media. Cultures were examined periodically for the development of perithecia. Ascospores were measured and described from perithecia squashed in lactic acid. Morphological characters were examined using a Leica DM6000 LED compound microscope with differential interference contrast (DIC) optics.

DNA extraction, PCR amplification and sequencing

The 260 Colletotrichum isolates were initially identified on the basis of culture characteristics on PDA (based on distinct morphotype groups), morphology of the spores, and/or internal transcribed spacer and intervening 5.8S nrDNA gene (ITS) sequence. A total of 115 isolates were identified as C. truncatum and the remaining 145 isolates with straight conidia were subsequently selected for multigene phylogenetic analyses. Genomic DNA was extracted from fresh mycelia grown on PDA using the DNeasy Plant Mini kit (QIAGEN, Australia), following the manufacturer’s instructions. DNA quality was assessed on a 1.4% (w/v) agarose gel, quantified by comparing with a known amount of Lambda DNA/HindIII marker (Invitrogen, Australia), diluted to 2 ng/μL and then stored at _20 °C until ready for PCR.

Isolates belonging to the acutatum complex were further analysed with partial gene sequences of five genomic loci: an intron sequence of the glyceraldehyde-3-phosphate dehydrogenase (gapdh), partial sequences of the chitin synthase 1 (chs-1), actin (act), beta-tubulin (tub2) and histone 3 (his3) genes. Isolates of the gloeosporioides complex were further analysed with chs-1, act, gapdh, tub2, Apn2–MAT1–2 intergenic spacer and partial mating type MAT1–2 gene (ApMat) and glutamine synthetase (gs) genes. Isolates belonging to the boninense and orchidearum complexes were further analysed with gapdh, tub2 and act genes. The genes were amplified and sequenced using the respective primer pairs for each gene region: ACT-512F + ACT-783R (act; Carbone and Kohn 1999), AMF1 + AMR1 (ApMat; Silva et al. 2012b), CHS-79F + CHS-345R (chs-1; Carbone and Kohn 1999), GDF1 + GDR1 (gapdh; Guerber et al. 2003), GSF1 + GSR1 (gs; Stephenson et al. 1997), CYLH3F + CYLH3R (his3; Crous et al. 2004a), ITS1 + ITS4 (ITS; White et al. 1990), and Btub2Fd + Btub4Rd (tub2; Woudenberg et al. 2009).

The PCR for each reaction was performed in a 2720 Thermal Cycler (Applied Biosystems) in a total volume of 25 μL, comprised of 1× PCR buffer, 0.2 mM dNTP, 0.4 μM of each primer, 2 mM MgCl2, 1 U Taq DNA polymerase (MangoTaq DNA polymerase; Bioline) and 6 ng template DNA and components were adjusted as required. PCR amplification protocols were performed as described by Damm et al. (2012a, 2012b) and Silva et al. (2012), except for the annealing temperatures which were adjusted to 55 °C for ITS, gapdh, tub2, 58 °C for act, 60 °C for gs and 62 °C for ApMat.

All PCR products were purified with the QIAquick PCR Purification kit (QIAGEN, Australia), according to manufacturer’s instructions. DNA sequence analysis of the PCR products was carried out at either the Australian Genome Research Facility (AGRF, Melbourne) or at the Westerdijk Fungal Biodiversity Institute, Utrecht, the Netherlands. The purified PCR products were sequenced in both forward and reverse directions, and the consensus sequences were obtained by alignment using Geneious Pro v. 11.1.4 (Kearse et al. 2012). The consensus sequences were deposited in GenBank (Table 2) and taxonomic novelties in MycoBank (Crous et al. 2004b). Sequences of each locus were assembled with MEGA v. 6 (Tamura et al. 2013). GenBank accession numbers of all the isolates used in the phylogenetic analyses are listed in Table 2.

Table 2

Strains of Colletotrichum species used in the phylogenetic analyses with details of host and location, and GenBank accession numbers of the sequences

Species	Accession No.1	Host/Substrate	Country	GenBank accession number
				ITS	gapdh	chs-1	his3	act	tub2	ApMat	gs
Acutatum complex
C.abscissum	COAD 1877a	Citrus sinensis	Brazil	KP843126	KP843129	KP843132	KP843138	KP843141	KP843135
C. acutatum	CBS 112996, ATCC 56816, STE-U 5292a	Carica papaya	Australia	JQ005776	JQ948677	JQ005797	JQ005818	JQ005839	JQ005860	–	–
	CBS 144.29	Capsicum annuum	Sri Lanka	JQ948401	JQ948732	JQ949062	JQ949392	JQ949722	JQ950052	–	–
C. australisinense	CGMCC 3.18886, GX1655a	Hevea brasiliensis	China	MG209623	MG241962	MG241981	–	MG241947	MG209645
C. bannaense	CGMCC 3.18887, YNWD31a	Hevea brasiliensis	China	MG209638	MG242006	MG241996	–	MG242002	MG209660
C. brisbanense	CBS 292.67, DPI 11711a	Capsicum annuum	Australia	JQ948291	JQ948621	JQ948952	JQ949282	JQ949612	JQ949942	–	–
C. cairnsense	BRIP 63642a, CBS 140847a	Capsicum annuum	Australia	KU923672	KU923704	KU923710	KU923722	KU923716	KU923688	–	–
C. chrysanthemi	CBS 126518, PD 84/520a	Carthamus sp., twisted stem	Netherlands	JQ948271	JQ948601	JQ948932	JQ949262	JQ94992	JQ949922	–	–
C. cosmi	CBS 853.73, PD 73/856a	Cosmos sp., seed	Netherlands	JQ948274	JQ948604	JQ948935	JQ949265	JQ949595	JQ949925	–	–
C. costaricense	CBS 330.75a	Coffea arabica, cv. Typica, berry	Costa Rica	JQ948180	JQ948510	JQ948841	JQ949171	JQ949501	JQ949831
C. citri	CBS 134233a	C. aurantifolia shoot	China	KC293581	KC293741	–	–	KC293621	KC293661
C. cuscutae	IMI 304802a	Cuscuta sp.	Dominica	JQ948195	JQ948525	JQ948856	JQ949186	JQ949516	JQ949846
C. fioriniae	CBS 128517a	Fiorinia sp.	USA	JQ948292	JQ948622	JQ948953	JQ949283	JQ949613	JQ949943	–	–
C. godetiae	CBS 133.44a	Clarkia hybrida, cv. Kelvon Glory, seed	Denmark	JQ948402	JQ948733	JQ949063	JQ949393	JQ949723	JQ950053	–	–
C. guajavae	IMI 350839, CPC 18893a	Psidium guajava, fruit	India	JQ948270	JQ948600	JQ948931	JQ949261	JQ949591	JQ949921	–	–
C. indonesiense	CBS 127551, CPC 14986a	Eucalyptus sp.	Indonesia	JQ948288	JQ948618	JQ948949	JQ949279	JQ949609	JQ949939	–	–
C. javanense	CBS 144963 a , UOM 1115, EWINDO 3	Capsicum annuum	Indonesia	MH846576	MH846572	MH846573	MH846571	MH846575	MH846574	–	–
C. laticiphilum	CBS 112989, IMI 383015a	Hevea brasiliensis	India	JQ948289	JQ948619	JQ948950	JQ949280	JQ949610	JQ949940	–	–
C. limetticola	CBS 114.14a	Citrus aurantifolia, young twig	USA, Florida	JQ948193	JQ948523	JQ948854	JQ949184	JQ949514	JQ949844
C. lupini	CBS 109225, BBA 70884a	Lupinus albus	Ukraine	JQ948155	JQ948485	JQ948816	JQ949146	JQ949476	JQ949806	–	–
C. melonis	CBS 159.84a	Cucumis melo	Brazil	JQ948194	JQ948524	JQ948855	JQ949185	JQ949515	JQ949845
C. nymphaeae	CBS 515.78a	Nymphaea alba, leaf spot	Netherlands	JQ948197	JQ948527	JQ948858	JQ949518	JQ949848	JQ949848	–	–
C. paranaense	CBS 134729a, CPC 20901	Malus domestica	Brazil	KC204992	KC205026	KC205043	KC205004	KC205077	KC205060
C. paxtonii	IMI 165753a, CPC 18868	Musa sp.	Saint Lucia	JQ948285	JQ948615	JQ948946	JQ949276	JQ949606	JQ949936	–	–
C. salicis	CBS 607 94a	Salix sp., leaf spot	Netherlands	JQ948460	JQ948791	JQ949121	JQ949451	JQ949781	JQ950111	–	–
C. scovillei	CBS 120708, HKUCC 10893, Mj6	Capsicum annuum	Thailand	JQ948269	JQ948599	JQ948930	JQ949260	JQ949590	JQ949920	–	–
	CBS 126529, PD 94/921–3, BBA 70349a	Capsicum sp.	Indonesia	JQ948267	JQ948597	JQ948928	JQ949258	JQ949588	JQ949918	–	–
	CPC 28551	Capsicum annuum	Thailand	MH618287	MH618361	MH686337	MH707595	MH645871	–	–	–
	CPC 28552	Capsicum annuum	Thailand	MH618286	MH618362	MH686338	MH707594	MH645872	–	–	–
	CPC 28577	Capsicum annuum	Indonesia	MH618295	MH618363	MH686339	MH707593	MH645873	–	–	–
	CPC 28579	Capsicum annuum	Indonesia	MH618294	MH618364	MH686340	MH707592	MH645874	–	–	–
	CPC 28591	Capsicum annuum	Indonesia	MH618293	MH618365	MH686341	MH707591	MH645875	–	–	–
	CPC 28593	Capsicum annuum	Indonesia	MH618292	MH618366	MH686342	MH707590	MH645876	–	–	–
	CPC 28599	Capsicum annuum	Indonesia	MH618291	MH618367	MH686343	MH707589	MH645877	–	–	–
	CPC 28603	Capsicum annuum	Indonesia	MH618290	MH618368	MH686344	MH707588	MH645878	–	–	–
	CPC 28615	Capsicum annuum	Indonesia	MH618289	MH618369	MH686345	MH707587	MH645879	–	–	–
	CPC 28617	Capsicum annuum	Indonesia	MH618288	MH618370	MH686346	MH707586	MH645880	–	–	–
	CPC 30197, Coll 1	Capsicum annuum	Indonesia	MH618268	MH618334	MH686347	MH707585	MH645881	–	–	–
	CPC 30198, Coll 2	Capsicum annuum	Indonesia	MH618269	MH618335	MH686348	MH707584	MH645882	–	–	–
	CPC 30199, Coll 3	Capsicum annuum	Indonesia	MH618270	MH618336	MH686349	MH707583	MH645883	–	–	–
	CPC 30200, Coll 4	Capsicum annuum	Indonesia	MH618271	MH618337	MH686350	MH707582	MH645884	–	–	–
	CPC 30201, Coll 5	Capsicum annuum	Indonesia	MH618272	MH618338	MH686351	MH707581	MH645885	–	–	–
	CPC 30202, Coll 6	Capsicum annuum	Indonesia	MH618273	MH618339	MH686352	MH707580	MH645886	–	–	–
	CPC 30205, Coll 9	Capsicum annuum	Indonesia	MH618274	MH618340	MH686353	MH707579	MH645887	–	–	–
	CPC 30206, Coll 10	Capsicum annuum	Indonesia	MH618275	MH618341	MH686354	MH707578	MH645888	–	–	–
	CPC 30215, Coll 19	Capsicum annuum	Indonesia	MH618276	MH618342	MH686355	MH707577	MH645889	–	–	–
	CPC 30216, Coll 20	Capsicum annuum	Indonesia	MH618277	MH618343	MH686356	MH707576	MH645890	–	–	–
	CPC 30217, Coll 21	Capsicum annuum	Indonesia	MH618278	MH618344	MH686357	MH707575	MH645891	–	–	–
	CPC 30218, Coll 22	Capsicum annuum	Indonesia	MH618279	MH618345	MH686358	MH707574	MH645892	–	–	–
	CPC 30219, Coll 23	Capsicum annuum	Indonesia	MH618280	MH618346	MH686359	MH707573	MH645893	–	–	–
	CPC 30220, Coll 24	Capsicum annuum	Indonesia	MH618281	MH618347	MH686360	MH707572	MH645894	–	–	–
	CPC 30229, Coll 33	Capsicum annuum	Thailand	MH618282	MH618348	MH686361	MH707571	MH645895	–	–	–
	CPC 30230, Coll 34	Capsicum annuum	Thailand	MH618283	MH618349	MH686362	MH707570	MH645896	–	–	–
	CPC 30231, Coll 35	Capsicum annuum	Thailand	MH618284	MH618350	MH686363	MH707569	MH645897	–	–	–
	CPC 30232, Coll 36	Capsicum annuum	Thailand	MH618285	MH618351	MH686364	MH707568	MH645898	–	–	–
	CPC 30239, Coll 153	Capsicum annuum	Taiwan	MH618299	MH836634	MH707528	MH707611	MH645855	MH635064	–	–
	CPC 30240, Coll 329	Capsicum annuum	Taiwan	MH618300	MH836635	MH707529	MH707610	MH645856	MH635065	–	–
	CPC 30241, Coll 524	Capsicum annuum	Taiwan	MH618301	MH836637	MH707530	MH707609	MH645857	MH635067	–	–
	CPC 30242, Coll 683	Capsicum annuum	Taiwan	MH618302	MH836638	MH707531	MH707608	MH645858	MH635068	–	–
	CPC 30243, Coll 1296	Capsicum annuum	Taiwan	MH618303	MH836639	MH707532	MH707607	MH645859	MH635069	–	–
	CPC 30244, Coll 1297	Capsicum annuum	Taiwan	MH618304	MH836640	MH707533	MH707606	MH645860	MH635070	–	–
	CPC 30246, Coll 1300	Capsicum annuum	Taiwan	MH618305	MH836641	MH707534	MH707605	MH645861	MH635071	–	–
	CPC 30247, Coll 1301	Capsicum annuum	Taiwan	MH618306	MH836642	MH707535	MH707604	MH645862	MH635072	–	–
	CPC 30248, Coll 1302	Capsicum annuum	Taiwan	MH618308	MH836643	MH707536	MH707603	MH645863	MH635073	–	–
	CPC 30249, Coll 1303	Capsicum annuum	Taiwan	MH618307	MH836644	MH707537	MH707602	MH645864	MH635074	–	–
	CPC 30250, Coll 1304	Capsicum annuum	Taiwan	MH618309	MH836645	MH707538	MH707601	MH645865	MH635075	–	–
	CPC 30251, Coll 1306	Capsicum annuum	Taiwan	MH618310	MH836646	MH707539	MH707600	MH645866	MH635076	–	–
	CPC 30252, Coll 141	Capsicum annuum	Taiwan	MH618311	MH836633	MH707540	MH707599	MH645867	MH635063	–	–
	UOM 1101, 313	Capsicum annuum	Thailand	MH618256	MH618324	MH686324	MH707557	MH635089	MH635049	–	–
	UOM 1102, 322	Capsicum annuum	Thailand	MH618259	MH618325	MH686325	MH707556	MH635090	MH635050	–	–
	UOM 1103, 311	Capsicum annuum	Thailand	MH618255	MH618326	MH686326	MH707555	MH635091	MH635051	–	–
	UOM 1104, 314	Capsicum annuum	Thailand	MH618257	MH618327	MH686327	MH707554	MH635092	MH635052	–	–
	UOM 1105, MJ3	Capsicum annuum	Thailand	MH618264	MH618328	MH686328	MH707553	MH635093	MH635053	–	–
	UOM 1106, MJ5	Capsicum annuum	Thailand	MH618265	MH618329	MH686329	MH707552	MH635094	MH635054	–	–
	UOM 1107, MJ7	Capsicum annuum	Thailand	MH618266	MH618330	MH686330	MH707551	MH635095	MH635055	–	–
	UOM 1108, MJ8	Capsicum annuum	Thailand	MH618267	MH618331	MH686331	MH707550	MH635096	MH635056	–	–
	UOM 1109, 211	Capsicum annuum	Thailand	MH618254	MH618332	MH686332	MH707549	MH635097	MH635057	–	–
	UOM 1110, 316	Capsicum annuum	Thailand	MH618258	MH618333	MH686333	MH707548	MH635098	MH635058	–	–
	UOM 1111, GA1	Capsicum annuum	Thailand	MH618260	MH618357	MH686334	MH707547	MH635099	MH635059	–	–
	UOM 1112, GA2	Capsicum annuum	Thailand	MH618261	MH618358	MH686335	MH707546	MH635100	MH635060	–	–
	UOM 1113, GA3	Capsicum annuum	Thailand	MH618262	MH618359	–	MH707545	MH635101	MH635061	–	–
	UOM 1114, GA5	Capsicum annuum	Thailand	MH618263	MH618360	MH686336	MH707544	MH635102	MH635062	–	–
	UOM 1140, F59	Capsicum annuum	Malaysia	MH618316	MH618355	MH686322	MH707559	MH635087	MH635047	–	–
	UOM 1141, A15	Capsicum annuum	Malaysia	MH618313	MH618356	MH686323	MH707558	MH635088	MH635048	–	–
	UOM 1142, Coll 1307	Capsicum annuum	Taiwan	MH618298	MH836647	MH707542	MH707597	MH645869	MH635077	–	–
	UOM 1143, Coll 1311	Capsicum annuum	Taiwan	MH618296	MH836648	MH707543	MH707596	MH645870	MH635078	–	–
	UOM 1144, EWINDO 2	Capsicum annuum	Indonesia	MH587232	MH618317	MH686314	MH707567	MH635079	MH836628	–	–
	UOM 1145, EWINDO 8	Capsicum annuum	Indonesia	MH587231	MH618318	MH686315	MH707566	MH635080	MH836629	–	–
	UOM 1146, EWINDO 10	Capsicum annuum	Indonesia	MH587233	MH618319	MH686316	MH707565	MH635081	MH836630	–	–
	UOM 1147, EWINDO 14	Capsicum annuum	Indonesia	MH587234	MH618320	MH686317	MH707564	MH635082	MH836631	–	–
	UOM 1148, EWINDO 15	Capsicum annuum	Indonesia	MH587235	MH618321	MH686318	MH707563	MH635083	MH836632	–	–
	UOM 1149, Coll 365	Capsicum annuum	Taiwan	MH618297	MH836636	MH707541	MH707598	MH645868	MH635066	–	–
	UOM 1150, 4–46-3D	Capsicum annuum	Malaysia	MH618312	MH618352	MH686319	MH707562	MH635084	MH635044	–	–
	UOM 1151, E15	Capsicum annuum	Malaysia	MH618314	MH618353	MH686320	MH707561	MH635085	MH635045	–	–
	UOM 1152, E16	Capsicum annuum	Malaysia	MH618315	MH618354	MH686321	MH707560	MH635086	MH635046	–	–
C. simmondsii	CBS 122122a	Carica papaya, fruit	Australia	JQ948276	JQ948606	JQ948937	JQ949267	JQ949597	JQ949927	–	–
C. sloanei	IMI 364297, CPC 18929a	Theobroma cacao, leaf	Malaysia	JQ948287	JQ948617	JQ948948	JQ949278	JQ949608	JQ949938	–	–
C. tamarilloi	CBS 129814, T.A.6a	Solanum betaceum, fruit	Colombia	JQ948184	JQ948514	JQ948845	JQ949175	JQ949505	JQ949835	–	–
C. walleri	CBS 125472, BMT(HL)19a	Coffea sp., leaf tissue	Vietnam	JQ948275	JQ948605	JQ948936	JQ949266	JQ949596	JQ949926	–	–
Boninense complex
C. annellatum	CBS 129826a	Hevea brasiliensis, leaf	Colombia	JQ005222	JQ005309	JQ005396	–	JQ005570	JQ005656	–	–
C. beeveri	CBS 128527, ICMP 18594a	Brachyglottis repanda	New Zealand	JQ005171	JQ005258	JQ005345	–	JQ005519	JQ005605	–	–
C. boninense	CBS 123755a, MAFF 305972	Crinum asiaticum var. sinicum	Japan	JQ005153	JQ005240	JQ005327	–	JQ005501	JQ005588	–	–
C. brasiliense	CBS 128501a, ICMP 18607, PAS12	Passiflora edulis, fruit anthracnose	Brazil	JQ005235	JQ005322	JQ005409	–	JQ005583	JQ005669	–	–
C. brassicicola	CBS 101059a, LYN 16331	Brassica oleracea var. gemmifera, leaf spot	New Zealand	JQ005172	JQ005259	JQ005346	–	JQ005520	JQ005606	–	–
C. constrictum	CBS 128504a, ICMP 12941	Citrus limon, fruit rot	New Zealand	JQ005238	JQ005325	JQ005412	–	JQ005586	JQ005672	–	–
C. karsti	CAUOS1	Capsicum sp.	China	KP890103	KP890134	KP890118	–	KP890126	KP890110	–	–
	CAUOS7	Capsicum sp.	China	KP890108	KP890139	KP890124	–	KP890132	KP890116	–	–
	CBS 125468	Coffea sp., berry tissue	Vietman	JQ005197	JQ005284	JQ005371	–	JQ005545	JQ005631	–	–
	CBS 127595	Musa banksii	Australia	JQ005178	JQ005265	JQ005352	–	JQ005526	JQ005612	–	–
	CBS 129815, T.A.7	Solanum betaceum, fruit	Colombia	JQ005187	JQ005274	JQ005361	–	JQ005535	JQ005621	–	–
	CBS 129834	Musa sp.	Mexico	JQ005176	JQ005263	JQ005350	–	JQ005524	JQ005610	–	–
	CBS 129927	Anthurium sp.	Thailand	JQ005206	JQ005293	JQ005380	–	JQ005554	JQ005640	–	–
	CBS 128545, ICMP 18587	Capsicum annuum	New Zealand	JQ005207	JQ005294	JQ005381	–	JQ005555	JQ005641	–	–
	CBS 128548, ICMP 18589	Solanum lycopersicum	New Zealand	JQ005205	JQ005292	JQ005379	–	JQ005553	JQ005639	–	–
	CBS 132134, CGMCC 3.14194a	Vanda sp.	China	HM585409	HM585391	–	–	HM581995	HM585428	–	–
	CPC 28553	Capsicum annuum	Indonesia	MH844440	MH844444	MH844456	–	MH844449	MH844448	–	–
	CPC 28554	Capsicum annuum	Indonesia	MH844439	MH844443	MH844455	–	MH844450	MH844447	–	–
	CPC 28601	Capsicum annuum	Indonesia	MH844438	MH844442	MH844454	–	MH844451	MH844446	–	–
	CPC 28602	Capsicum annuum	Indonesia	MH844437	MH844441	MH844453	–	MH844452	MH844445	–	–
	GM44 L01a	Annona muricata	Colombia	KC512141	KC506413	KC512162	–	KC512183	KC512204	–	–
C. petchii	CBS 378.94a	Dracaena marginata	Italy	JQ005223	JQ005310	JQ005397	–	JQ005571	JQ005657	–	–
C. phyllanthi	CBS 175.67a, MACS 271	Phyllanthus acidus	India	JQ005221	JQ005308	JQ005395	–	JQ005569	JQ005655	–	–
Truncatum complex
C. truncatum	CBS 151.35	Phaseolus lunatus	USA	GU227862	GU228254	GU228352	–	GU227960	GU228156	–	–
Gloeosporioides complex
C. aenigma	ICMP 18608a	Persea americana	Israel	JX010244	JX010044	JX009774	–	JX009443	JX010389	KM360143	JX010078
	ICMP 18686	Pyrus pyrifolia	Japan	JX010243	JX009913	JX009789	–	JX009519	JX010390	–	JX010079
C. aeschynomenes	ICMP 17673a, ATCC 201874	Aeschynomene virginica	USA	JX010176	JX009930	JX009799	–	JX009483	JX010392	KM360145	JX010081
C. alatae	CBS 304.67a, ICMP 17919	Dioscorea alata	India	JX010190	JX009990	JX009837	–	JX009471	JX010383	KC888932	JX010065
C. alienum	ICMP 12071a	Malus domestica	New Zealand	JX010251	JX010028	JX009882	–	JX009572	JX010411	KM360144	JX010101
	ICMP 18621	Persea americana	New Zealand	JX010246	JX009959	JX009755	–	JX009552	JX010386	–	JX010075
C. aotearoa	ICMP 18537a	Coprosma sp.	New Zealand	JX010205	JX010005	JX009853	–	JX009564	JX010420	KC888930	JX010113
C. asianum	ICMP 18580a, CBS 130418	Coffea arabica	Thailand	FJ972612	JX010053	JX009867	–	JX009584	JX010406	FR718814	JX010096
	IMI 313839, ICMP 18696	Mangifera indica	Australia	JX010192	JX009915	JX009753	–	JX009576	JX010384	–	JX010073
C. camelliae	CGMCC 3.14925, LC1364a	Camellia sinensis	China	KJ955081	KJ954782	–	–	KJ954363	KJ955230	KJ954497	KJ954932
C. changpingense	MFLUCC 150022a	Fragaria ananassa	China	KP683152	KP852469	KP852449	–	KP683093	KP852490	–	–
C. chrysophilum	CMM 4268a, URM 7362	Musa sp.	Brazil	KX094252	KX094183	KX094083	–	KX093982	KX094285	–	–
C. clidemiae	ICMP 18706a	Clidemia hirta	USA, Hawaii	JX010265	JX009989	JX009877	–	JX009537	JX010438	KC888929	JX010129
C. conoides	CAUG17a	Capsicum annuum	China	KP890168	KP890162	KP890156	–	KP890144	KP890174	–	–
C. cordylinicola	MFLUCC 090551a, ICMP 18579	Cordyline fruticosa	Thailand	JX010226	JX009975	JX009864	–	HM470235	JX010440	JQ899274	JX010122
C. endophyticum	CAUG28	Capsicum annuum	China	KP145441	KP145413	KP145385	–	KP145329	KP145469	–	–
	DNCL075	Unknown wild fruit	Thailand	KF242123	KF242181	–	–	KF157827	KF254857	–	KF242154
	LC0324a	Pennisetum purpureum	Thailand	KC633854	KC832854	–	–	KF306258	–	–	–
	UOM 1137, F5-2D	Capsicum annuum	Thailand	MH728809	MH707467	MH805853	–	MH781483	MH846566	MH728828	MH748267
C. fructicola	I TCC 6270	Mangifera indica	India	–	KC790774	KC888935	–	KC790663	KC790909	KC790713	–
	ICMP 18581a, CBS 130416	Coffea arabica	Thailand	JX010165	JX010033	JX009866	–	FJ907426	JX010405	JQ807838	JX010095
	LC2923, LF130	Camellia sinensis	China	KJ955083	KJ954784	–	–	KJ954365	KJ955232	KJ954499	KJ954934
	CPC 28644	Capsicum annuum	Thailand	MH728811	MH707465	MH805851	–	MH781481	MH846564	MH728830	MH748265
	CPC 28645	Capsicum annuum	Thailand	MH728810	MH707466	MH805852	–	MH781482	MH846565	MH728829	MH748266
	UOM 1138, CPC 30253, Coll 853	Capsicum annuum	Taiwan	MH728817	MH707463	MH805846	–	MH781476	MH846559	MH728835	MH748260
	UOM 1139, Coll 1318	Capsicum annuum	Taiwan	MH728808	MH707468	MH805854	–	MH781484	MH846567	MH728827	MH748268
C. gloeosporioides	IMI 356878, ICMP 17821, CBS 112999a	Citrus sinensis	Italy	JX010152	JX010056	JX009818	–	JX009531	JX010445	JQ807843	JX010085
C. grevilleae	CBS 132879, CPC 15481a	Grevillea sp.	Italy	KC297078	KC297010	KC296987	–	KC296941	KC297102	–	KC297033
C. grossum	CGMCC3.17614, CAUG7a	Capsicum sp.	China	KP890165	KP890159	KP890153	–	KP890141	KP890171	–	MG826120
C. hebeiense	MFLUCC13 0726a, JZB330028	Vitis vinifera	China	KF156863	KF377495	KF289008	–	KF377532	KF288975	–	–
C. helleniense	CBS 142418a, CPC 26844	Poncirus trifoliata	Greece	KY856446	KY856270	KY856186	–	KY856019	KY856528	–	–
C. henanense	LC3030, CGMCC 3.17354a	Camellia sinensis	China	KJ955109	KJ954810	–	–	KM023257	KJ955257	KJ954524	KJ954960
C. horii	ICMP 10492, MTCC 10841a	Diospyros kaki	Japan	GQ329690	GQ329681	JX009752	–	JX009438	JX010450	JQ807840	JX010137
C. hystricis	CBS 142411a, CPC 28153	Citrus hystrix	Italy	KY856450	KY856274	KY856190	–	KY856023	KY856532	–	–
C. jiangxiense	CGMCC 3.17363a	Camellia sinensis	China	KJ955201	KJ954902		–	KJ954471	KJ955348	KJ954607	KJ955051
C. kahawae subsp. kahawae	IMI 319418, ICMP 17816a	Coffea arabica	Kenya	JX010231	JX010012	JX009813	–	JX009452	JX010444	JQ894579	JX010130
C. makassarense	CPC 28555	Capsicum annuum	Indonesia	MH728816	MH728822	MH805847	–	MH781477	MH846560	MH728834	MH748261
	CPC 28556	Capsicum annuum	Indonesia	MH728815	MH728821	MH805848	–	MH781478	MH846561	MH728833	MH748262
	CBS 143664 a , CPC 28612	Capsicum annuum	Indonesia	MH728812	MH728820	MH805850	–	MH781480	MH846563	MH728831	MH748264
C. musae	CBS 116870, ICMP 19119, MTCC 11349a	Musa sp.	USA	JX010146	JX010050	JX009896	–	JX009433	HQ596280	KC888926	JX010103
	CMM 4458	Musa sp.	Brazil	KX094249	KX094191	KX094080		KX093967	KX094292	–	–
C. nupharicola	CBS 469.96, ICMP 17938	Nuphar lutea subsp. polysepala	USA	JX010189	JX009936	JX009834	–	JX009486	JX010397	–	JX010087
	CBS 470.96, ICMP 18187a	Nuphar lutea subsp. polysepala	USA	JX010187	JX009972	JX009835	–	JX009437	JX010398	JX145319	JX010088
C. perseae	GA100a	Persea americana	Israel	KX620308	KX620242	–		KX620145	KX620341	KX620177	KX620275
C. proteae	CBS 132882a	Proteaceae	South Africa	KC297079	KC297009	KC296986		KC296940	KC297101
C. psidii	CBS 145.29, ICMP 19120a	Psidium sp.	Italy	JX010219	JX009967	JX009901	–	JX009515	JX010443	KC888931	JX010133
C. queenslandicum	ICMP 1778a	Carica papaya	Australia	JX010276	JX009934	JX009899	–	JX009447	JX010414	KC888928	JX010104
	ICMP 18705	Coffea sp.	Fiji	JX010185	JX010036	JX009890	–	JX009490	JX010412		JX010102
	BRIP 63695	Capsicum annuum	Australia							KU923727	KU923737
C. salsolae	CBS 119296, ICMP 18693	Glycine max (inoculated)	Hungary	JX010241	JX009917	JX009791	–	JX009559	–	–	–
	ICMP 19051a	Salsola tragus	Hungary	JX010242	JX009916	JX009863	–	JX009562	JX010403	KC888925	JX010093
C. siamense	CPC 28609	Capsicum annuum	Indonesia	MH728813	–	–	–	–	–	MH713886	MH748242
	CPC 30209, UOM 13	Capsicum annuum	Indonesia	MH707471	MH707452	MH805834	–	MH781464	MH846547	MH713897	MH748231
	CPC 30210, UOM 14	Capsicum annuum	Indonesia	MH707472	MH707453	MH805835	–	MH781465	MH846548	MH713896	MH748232
	CPC 30211, UOM15	Capsicum annuum	Indonesia	MH707473	MH707454	MH805836	–	MH781466	MH846549	MH713895	MH748233
	CPC 30212, UOM 16	Capsicum annuum	Indonesia	MH707474	MH707455	MH805837	–	MH781467	MH846550	MH713894	MH748234
	CPC 30221, UOM 25	Capsicum annuum	Thailand	MH707475	MH707456	MH805838	–	MH781468	MH846551	MH713893	MH748235
	CPC 30222, UOM26	Capsicum annuum	Thailand	MH707476	MH707457	MH805839	–	MH781469	MH846552	MH713892	MH748236
	CPC 30223, UOM27	Capsicum annuum	Thailand	MH707477	MH707458	MH805840	–	MH781470	MH846553	MH713891	MH748237
	CPC 30233, UOM37	Capsicum annuum	Indonesia	MH707478	MH707459	MH805841	–	MH781471	MH846554	MH713890	MH748238
	CPC 30234, UOM38	Capsicum annuum	Indonesia	MH707479	MH707460	MH805842	–	MH781472	MH846555	MH713889	MH748239
	CPC 30235, UOM39	Capsicum annuum	Indonesia	MH707480	MH707461	MH805843	–	MH781473	MH846556	MH713888	MH748240
	CPC 30236, UOM40	Capsicum annuum	Indonesia	MH707481	MH707462	MH805844	–	MH781474	MH846557	MH713887	MH748241
	UOM 1116	Capsicum annuum	Sri Lanka	MH707495	–	–	–	–	–	MH713872	MH748256
	UOM 1117	Capsicum annuum	Sri Lanka	MH707496	–	–	–	–	–	MH713871	MH748257
	UOM 1118	Capsicum annuum	Sri Lanka	MH707497	–	–	–	–	–	MH713870	MH748258
	UOM 1124, F1-3A	Capsicum annuum	Thailand	MH707482	–	–	–	–	–	MH713885	MH748243
	UOM 1125, F7-3B	Capsicum annuum	Thailand	MH707488	–	–	–	–	–	MH713879	MH748249
	UOM 1126, F4-1C	Capsicum annuum	Thailand	MH707484	–	–	–	–	–	MH713883	MH748245
	UOM 1127, F5-1A	Capsicum annuum	Thailand	MH707485	–	–	–	–	–	MH713882	MH748246
	UOM 1128, F7-1B	Capsicum annuum	Thailand	MH707487	–	–	–	–	–	MH713880	MH748248
	UOM 1129, F5-4A	Capsicum annuum	Thailand	MH707486	–	–	–	–	–	MH713881	MH748247
	UOM 1130, F1-3C	Capsicum annuum	Thailand	MH707483	–	–	–	–	–	MH713884	MH748244
	UOM 1131, F7-4A	Capsicum annuum	Thailand	MH707489	–	–	–	–	–	MH713878	MH748250
	UOM 1132, RC1	Capsicum annuum	Thailand	MH707490	–	–	–	–	–	MH713877	MH748251
	UOM 1133, RC2	Capsicum annuum	Thailand	MH707491	–	–	–	–	–	MH713876	MH748252
	UOM 1134, RC3	Capsicum annuum	Thailand	MH707492	–	–	–	–	–	MH713875	MH748253
	UOM 1135, RC4	Capsicum annuum	Thailand	MH707493	–	–	–	–	–	MH713874	MH748254
	UOM 1136, RC5	Capsicum annuum	Thailand	MH707494	–	–	–	–	–	MH713873	MH748255
	IMI 82267, CPC 16808	Vitis sp.	Brazil							KP703783	KP703698
	ICMP 18575,HKUCC 10884	Capsicum annuum	Thailand	JX010256	JX010059	JX009785	–	JX009455	JX010404	KP703769	JX010094
	ICMP 18578a, CBS 130417	Coffea arabica	Thailand	JX010171	JX009924	JX009865		FJ907423	JX010404		JX010094
	LC0144, PE004–1	Coffea sp.	China, Yunnan							KP703785	KP703700
	LC0148, PE007–1	Camellia sp.	China, Yunnan							KJ954494	KJ954929
C. siamense (syn. C. communis)	NK24, MTCC 11599	Mangifera indica	India							JQ894582
C. siamense (syn. C. endomangiferae)	CMM 3814a	Mangifera indica	Brazil	KC702994	KC702955	KC598113		KC702922	KM404170	KJ155453
C. siamense (syn. C. dianesei)	CMM 4083	Mangifera indica	Brazil							KX094304	KX094216
	CMM 4085a	Mangifera indica	Brazil							KX094306	KX094218
C. siamense (syn. C. hymenocallidis)	CBS 125378, ICMP 18642, LC0043a	Hymenocallis americana	China	JX010278	JX010019	GQ856730	–	JX009441	JX010410	JQ899283	JX010100
	CBS 112983, CPC 2291	Protea cynaroides	Zimbabwe	KC297065	KC297007	KC296984	–	KC296929	KC297100	KP703761	KC297030
	CBS 113199. CPC 2290	Protea cynaroides	Zimbabwe	KC297066	KC297008	KC296985	–	KC296930	KC297090	KP703763	KC297031
	CBS 116868	Musa sp.	India; Southern India	KC566815	KC566669	KC566382	–	KC566961	KP703429	KP703764	KP703679
C. siamense (syn. C. jasmini-sambac)	CBS 130420a, ICMP 19118	Jasminum sambac	Vietnam	HM131511	HM131497	JX009895	–	HM131507	JX010415	JQ807841	JX010105
	CPC 16135, WTS9	Persea americana	South Africa	KP703760	KP703678	KC566375	–	KC566954	KP703597	KP703845	KP703760
C. siamense (syn. C. melanocaulon)	CBS 133251, coll131, BPI 884113a	Vaccinium macrocarpon	USA	–	–	–	–	–	–	JX145313	KP703685
C. siamense (syn. C. murrayae)	CBS 133239, GZAAS5.09506a	Murraya sp.	China	–	–	–	–	–	–	KP703770	JQ247621
C. syzygicola	DNCL021 MFLUCC 100624	Syzygium samarangense	Thailand	KF242094	KF242156	–	–	KF157801	KF254880	–	–
C. tainanense	CBS 143666 a , CPC 30245, UOM 1120, Coll 1298	Capsicum annuum	Taiwan	MH728818	MH728823	MH805845	–	MH781475	MH846558	MH728836	MH748259
	UOM 1119, Coll 1290	Capsicum annuum	Taiwan	MH728805	MH728819	MH805857	–	MH781487	MH846570	MH728824	MH748271
C. theobromicola	MTCC 11350, CBS 124945, ICMP 18649a	Theobroma cacao	Panama	JX010294	JX010006	JX009869	–	JX009444	JX010447	KC790726	JX010139
C. ti	ICMP 4832a	Cordyline sp.	New Zealand	JX010269	JX009952	–	–	JX009520	JX010442	KM360146	JX010123
C. tropicale	CBS 124943, ICMP 18651	Annona muricata	Panama	JX010277	JX010014	JX009868	–	JX009570	–	KC790728	–
	CBS 124946	Unknown	Brazil	KC566806	KC566660	KC566373	–	KC566952	KC566228	–	–
	CBS 124949, ICMP 18653, MTCC 11371a	Theobroma cacao	Panama	JX010264	JX010007	JX009870	–	JX009489	JX010407	KC790728	JX010097
	CMM 4071	Mangifera indica	Brazil	KC329785	KC517181	–	–	KC533726	KC517258	–	–
	CMM 4243	Musa sp.	Brazil	KU213603	KU213601	KU213600	–	KU213596	KU213604	–	–
	CPC 16260	Unknown	Brazil	KC566807	KC566661	KC566374	–	KC566953	KC566229	–	–
	GM04-L01	Annona muricata	Colombia	KC512125	KC506397	KC512146	–	KC512167	KC512188	–	–
	GM33-L01	Annona muricata	Colombia	KC512128	KC506400	KC512149	–	KC512170	KC512191	–	–
	CPC 28607	Capsicum annuum	Indonesia	MH728814	MH707464	MH805849	–	MH781479	MH846562	MH728832	MH748263
	UOM 1002	Capsicum annuum	Indonesia	MH728807	MH707469	MH805855	–	MH781485	MH846568	MH728826	MH748269
	UOM 1003	Capsicum annuum	Indonesia	MH728806	MH707470	MH805856	–	MH781486	MH846569	MH728825	MH748270
C. viniferum	GZAAS 5.08601a	Vitis vinifera	China	JN412804	JN412798	–	–	JN412795	JN412813	–	JN412787
	CAUG27	Capsicum sp.	China	KP145440	KP145412	KP145356	–	KP145384	KP145468	–	–
C. wuxiense	CGMCC 3.17894a	Camellia sinensis	China	KU251591	KU252045	KU251939	–	KU251672	KU252200	KU251722	KU252101
C. xanthorrhoeae	BRIP 45094, ICMP 17903, CBS 127831a	Xanthorrhoea preissii	Australia	JX010261	JX009927	JX009823	–	JX009478	JX010448	KC790689	JX010138
Orchidearum complex
C. cattleyicola	CBS 170.49a	Cattleya sp.	Belgium	MG600758	MG600819	–	–	MG600963	MG601025
C. cliviicola	CBS 125375a	Clivia miniata	China	MG600733	MG600795	–	–	MG600939	MG601000	–	–
	CSSK4	Clivia miniata	China	GQ485607	GQ856756	–	–	GQ856777	GQ849440	–	–
	CSSS1	Clivia miniata	China	GU109479	GU085868	–	–	GU085861	GU085869	–	–
	CSSS2	Clivia miniata	China	GU109480	GU085868	–	–	GU085862	GU085870	–	–
C. dracaenophilum	CBS 118199a	Dracaena sanderana	China	JX519222	JX546707	–	–	JX519238	JX519247	–	–
C. musicola	CBS 132885a	Musa sp.	Mexico	MG600736	MG600798	–	–	MG600942	MG601003	–	–
C. orchidearum	CBS 135131a	Dendrobium nobile	Netherlands	MG600738	MG600800	–	–	MG600944	MG601005	–	–
C. piperis	IMI 71397, CPC 21195a	Piper nigrum	Malaysia	MG600760	MG600820	–	–	MG600964	MG601027
C. plurivorum	CBS 125474a	Coffea sp.	Vietnam	MG600718	MG600781	–	–	MG600925	MG600985	–	–
	CBS 132443	Coffea sp.	Vietnam	MG600717	MG600780	–	–	MG600924	MG600984	–	–
	CMM 3742	Mangifera indica	Brazil	KC702980	KC702941	–	–	KC702908	KC992327	–	–
	CMM 3746	Mangifera indica	Brazil	KC702981	KC702942	–	–	KC702909	KC992328	–	–
	CORCG2	Cymbidium hookerianum	China	HM585397	HM585380	–	–	HM581985	HM585422	–	–
	CPC 28638	Capsicum annuum, leaf	Thailand	MH805810	MH805816	–	–	MH805828	MH805824	–	–
	CPC 28639	Capsicum annuum, leaf	Thailand	MH805811	MH805817	–	–	MH805829	MH805825	–	–
	LJTJ 16	Capsicum annuum	China	KP748207	KP823786	–	–	KP823739	KP823851	–	–
	LJTJ 22	Capsicum annuum	China	KP748213	KP823792	–	–	KP823740	KP823852	–	–
	LJTJ 30	Capsicum annuum	China	KP748221	KP823800	–	–	KP823741	KP823853	–	–
	UOM 1004	Capsicum annuum	Thailand	MH805812	MH805818	–	–	MH805830	MH805824	–	–
	UOM 1005	Capsicum annuum	Thailand	MH805813	MH805819	–	–	MH805831	MH805825	–	–
	UOM 1006	Capsicum annuum	Thailand	MH805814	MH805820	–	–	MH805832	MH805826	–	–
	UOM 1153, M2	Capsicum annuum	Malayasia	MH805815	MH805821	–	–	–	MH805827	–	–
C. sojae	CAUOS5	Capsicum sp.	China	KP890107	KP890138	–	–	–	KP890114	–	–
	ATCC 62257a	Glycine max	USA	MG600749	MG600810	–	–	MG600954	MG601016	–	–
C. vittalense	CBS 181.82a	Theobroma cacao	India	MG600734	MG600796	–	–	MG600940	MG601001	–	–

1ATCC American Type Culture Collection, BBA Culture collection of the Biologische Bundesanstalt fur Land- und Forstwirtschaft, Berlin, Germany, BRIP Queensland Plant Pathology Herbarium, Australia, CPC Culture collection of P.W. Crous, housed at Westerdijk Fungal Biodiversity Institute, CBS Westerdijk Fungal Biodiversity Institute, Utrecht, The Netherlands, CGMCC China, General Microbiological Culture Collection, Beijing, China, DPI Department of Primary Industries, HKUCC The University of Hong Kong Culture Collection, Hong Kong, China, ICMP International Collection of Microorganisms from Plants, Landcare Research, Auckland, New Zealand, IMI Culture collection of CABI Europe UK Centre, Egham, UK, LC Working collection of Lei Cai, housed at CAS, China, LF Working collection of Fang Liu, housed at CAS, China, MFLUCC Mae Fah Luang University Culture Collection, ChiangRai, Thailand, NBRC NITE Biological Resource Center, Chiba, Japan, PD Plantenziektenkundige Dienst Wageningen, Netherlands, UOM University of Melbourne culture collection, Victoria, Australia, ZJUD Diaporthe strains in Zhejiang University, China. Cultures indicated with an asterisk (a) are ex-type cultures

Isolates and accession numbers in bold represents the isolates used in this study

Phylogenetic analyses

Gene sequences of each isolate were examined using Geneious Pro v. 11.1.4, aligned by CLUSTALW2 (Larkin et al. 2007) and edited manually where necessary. ITS and tub2 sequences of selected isolates representing all the species complexes were analysed to determine to which clade each isolate belonged, and an initial phylogenetic tree was produced with a maximum likelihood analysis (ML) as implemented in MEGA v. 6 with 1000 bootstrap replicates (data not shown). For isolates from the acutatum complex, concatenated datasets were generated comprising ITS, chs-1, act, gapdh, his3 and tub2 gene sequences. For isolates from the gloeosporioides complex, two concatenated datasets were generated comprising ITS, chs-1, act, gapdh and tub2 gene sequences, and comprising ApMat and gs gene sequences. For isolates from the boninense and orchidearum complexes concatenated datasets were generated comprising ITS, gapdh, act and tub2 gene sequences. Selected reference or ex-type strains from each complex (Table 2) were included in the analyses (Damm et al. 2012b, 2019; Marin-Felix et al. 2017; Weir et al. 2012).

Further phylogenetic analyses were performed using MrBayes v. 3.2.6 (Ronquist et al. 2012) for Bayesian inference analyses (BI), and PAUP (Phylogenetic Analysis Using Parsimony) v. 4.0b10 (Swofford 2003) for parsimony analyses. For BI analyses, the best nucleotide substitution model for each locus was determined by MrModeltest v. 2.3 (Nylander 2004) (Table 3), and eight simultaneous MCMC chains were run for 1 bn generations. Trees were sampled every 100 generations for the acutatum, boninense and orchidearum complexes, and every 1000 generations for the gloeosporioides complex 2-gene alignment and every 10 generations for the gloeosporioides complex 5-gene alignment. The heating parameter was set to 0.2 and analyses stopped once the average standard deviation of split frequencies was below 0.01. The first 25% of trees, representing the burn-in phase of the analyses, were discarded and the remaining trees in each analysis were used to calculate posterior probabilities. The generated 50% majority rule consensus tree was viewed in TreeView v. 1.6.6 (Page 1996). A maximum parsimony (MP) analysis was performed on the multilocus alignments as well as for each gene separately with PAUP v. 4.0b10 (Swofford 2003) using the heuristic search option with 100 random sequence additions and tree bisection and reconstruction (TBR) as the branch-swapping algorithm. Gaps were treated as new character states and missing data as missing characters. Bootstrap support values were calculated based on 1000 bootstrap replicates. Statistical measures calculated included tree length (TL), consistency index (CI), retention index (RI) and rescaled consistency index (RC) (Table 3). Alignments and tree files are deposited in TreeBASE (accession https://www.treebase.org/treebase-web/home.html; study S23829).

Table 3

Statistical information of the different phylogenetic analyses performed on each Colletotrichum complex

Dataset	Parameters and statistics of the Bayesian analyses									Total number of generations run
	Substitution models (Number of Unique site patterns)								Number of trees used in consensus
	ITS	gapdh	tub2	act	chs-1	his3	ApMat	gs
acutatum complex	HKY + I (108)	SYM + G (151)	GTR + G (134)	GTR + G (86)	K80 + I (54)	GTR + G (96)			45,602	3,040,000
boninense complex	HKY + I (42)	HKY (130)	HKY + G (111)	HKY + G (94)	HKY + G (55)				12,002	80,000
gloeosporioides complex, 2-gene							HKY + G (520)	GTR + G (432)	442,502	29,500,000
gloeosporioides complex, 5-gene	SYM + I (73)	HKY + G (163)	SYM + I (180)	HKY + I (85)	K80 + G (55)				102,752	685,000
orchidearum complex	GTR + I (34)	HKY (55)	HKY (90)	HKY (42)					4128	275,000
	Statistics of the parsimony analyses
	Number of strains (incl. Outgroup(s))	Number of included characters	Number of parsimony-informative characters	Number of parsimony-uninformative characters	Number of constant characters	Tree Length (TL)	Consistency index (CI)	Retention index (RI)	Rescaled consistency index (RC)	Number of equally most parsimonious trees saved
acutatum complex	100	2210	282	438	1490	1190	0.76	0.79	0.6	1000
boninense complex	24	1743	189	343	1211	776	0.87	0.79	0.68	3
gloeosporioides complex, 2-gene	92	1715	559	539	617	2003	0.73	0.88	0.64	161
gloeosporioides complex, 5-gene	85	1724	306	222	1196	926	0.71	0.857	0.610	1000
orchidearum complex	26	1417	72	282	1063	411	0.92	0.85	0.78	284

Pathogenicity assay

Pathogenicity tests on chili fruit were conducted using only Colletotrichum isolates with straight conidia as previous studies had extensively studied the pathogenicity of C. truncatum in chili (Mongkolporn et al. 2010, Ranathunge et al. 2012). There were 15 representative isolates of C. scovillei from Indonesia, Thailand and Taiwan, 10 isolates of C. siamense from Indonesia and Thailand, and one isolate each from the other eight species with straight conidia. Detached mature red chili fruits (Capsicum annuum genotype Bangchang) were used for the pathogenicity assay as described by De Silva et al. (2017a). Pathogenicity of each isolate was tested with both non-wound and wound inoculation methods. Three replicate fruits were tested per isolate while experiments were carried out three times.

Data were analysed using the Mixed Procedure in SAS v. 9.4 by fitting the linear mixed model:

Y = μ + S + I(S) + R + R ∗ S + R ∗ I(S) + e

where μ is the grand mean, S is the fixed species effect, and R, R*S, R*I(S) and e are respectively the random effects of replicate, replicate by species interaction, replicate by isolate within species interaction, and error. Separate analyses were done for wound and non-wound data as preliminary analysis showed there was significant species by wound interaction. Least squared means were estimated for each species and t-test carried out between each pair of means.

RESULTS

The Colletotrichum isolates with falcate conidia and ITS sequences matching to those of the ex-type of C. truncatum were the most common (n = 115), representing 44% of all isolates. Colletotrichum truncatum was found in the collections from Indonesia, Malaysia, Sri Lanka and Thailand (Fig. 6). Colletotrichum truncatum isolates were not included in the collection from the World Vegetable Center in Taiwan as only the species with straight conidia were selected for identification. The remaining 56% of isolates (n = 145) were of species with straight conidia that mostly belonged to the acutatum and gloeosporioides complexes.

Fig. 6

Colletotrichum javanense (CBS 144963). a Colony on PDA. b Reverse side of the colony on PDA. c Conidioma on PDA. d-e Conidiophores and conidia. f Chlamydospores. g–j Appressoria. k Conidia. Bars = 10 μm

Acutatum complex

For the 69 isolates and 29 reference species in the acutatum complex, the phylogenetic analysis of the combined data sets using six genes (ITS, tub2, gapdh, chs-1, act and his3) with C. boninense (CBS 123755) as the outgroup comprised 100 isolates including the outgroup and 2315 characters including the alignment gaps and excluded characters. The Bayesian analysis of this alignment, based on 629 unique site patterns (ITS: 108, tub2: 134, gapdh: 151, act: 86, chs-1: 54 and his3: 96) lasted 3,040,000 generations, resulting in 60,802 total trees of which 45,602 trees were used to calculate the posterior probabilities. The parsimony analysis yielded the maximum of 1000 equally most parsimonious trees. Bootstrap support values of the MP analysis (MP > 49%) and the BI posterior probabilities (PP > 0.90) were plotted at the nodes (Fig. 1). Overall, the species clades recognised received similar support values, although the association between species did not always receive similar support, e.g. the node linking C. paranaense and C. melonis (MP < 50% / PP = 0.99). The phylogenetic analyses of the acutatum complex identified C. scovillei as the most prevalent species in Indonesia, Malaysia, Thailand and Taiwan. However, C. scovillei was not isolated from Sri Lanka. In addition, an isolate from Java in Indonesia (UOM 1115) clustered related to C. brisbanense (96% BS/1 PP; Fig. 1).

Fig. 1

First of 1000 equally most parsimonious trees obtained from a heuristic search of the combined ITS, tub2, gapdh, chs-1, his3 and act sequence alignment of the Colletotrichum isolates in the acutatum complex. The parsimony bootstrap support values (MP > 49%) and Bayesian posterior probabilities (PP > 0.90) are displayed at the nodes (MP/PP). The tree was rooted to C. boninense (CBS 123755). The bar indicates 40 changes. Coloured blocks are used to indicate clades containing isolates from chili

Boninense complex

For the four isolates and 10 reference species in the boninense complex the phylogenetic analyses of the combined data sets using five genes (ITS, gapdh, tub2, act and chs-1) with C. truncatum (CBS 151.35) as the outgroup comprised 24 isolates and 1867 characters including the alignment gaps and excluded characters (Fig. 2). The Bayesian analysis of the combined alignment, based on 432 unique site patterns (ITS: 42, gapdh: 130, tub2: 111, act: 94 and chs-1: 55) lasted 80,000 generations, resulting in 16,002 total trees of which 12,002 trees were used to calculate the posterior probabilities. The parsimony analysis yielded three equally most parsimonious trees. Bootstrap support values of the MP analysis (MP > 49%) and the BI posterior probabilities (PP > 0.90) were plotted at the nodes (Fig. 2). Overall, the nodes received similar support values, except for the subclustering of strains CBS 128545, CBS 128548 and CBS 129927 in the C. karsti clade (MP 67% / PP = 0.98).The phylogenetic analyses of the boninense complex identified the most prevalent species as C. karsti occurring only in Indonesia.

Fig. 2

First of three equally most parsimonious trees obtained from a heuristic search of the combined ITS, tub2, gapdh, chs-1 sequence alignment of the Colletotrichum isolates in the boninense complex. The parsimony bootstrap support values (MP > 49%) and Bayesian posterior probabilities (PP > 0.90) are displayed at the nodes (MP/PP). The tree was rooted to C. truncatum (CBS 151.35). The bar indicates 30 changes. Coloured blocks are used to indicate clades containing isolates from chili

Gloeosporioides complex

For the 42 isolates and the 41 reference species in the gloeosporioides complex, two phylogenetic trees were constructed, one from the ApMat and gs sequence alignment and the second from the ITS, gapdh, act, tub2, chs-1 sequence alignment (Figs. 3 and 4). The analyses using the 5-gene alignment with C. theobromicola CBS 124945 as the outgroup (Fig. 4) comprised 85 isolates including the outgroup and 1863 characters including the alignment gaps and excluded characters. The Bayesian analysis of the combined alignment, based on 556 unique site patterns (ITS: 73, gapdh: 163, act: 85, tub2: 180, chs-1: 55) lasted 685,000 generations, resulting in 137,002 total trees of which 102,752 trees were used to calculate the posterior probabilities. The parsimony analysis yielded the maximum of 1000 equally most parsimonious trees. Bootstrap support values of the MP analysis (MP > 49%) and the BI posterior probabilities (PP > 0.90) were plotted at the nodes (Fig. 4). Overall, the species clades recognised in this study received similar support values, except for the C. siamense clade (MP < 50% / PP < 0.91) and the C. fructicola clade (MP 57% / PP = 0.99).

Fig. 3

Phylogenetic analysis of Colletotrichum isolates in the gloeosporioides complex based on a 50% majority rule consensus tree derived from Bayesian analysis of the ApMat and gs regions. The parsimony bootstrap support values (MP > 49%) and Bayesian posterior probabilities (PP > 0.90) are displayed at the nodes (MP/PP). The tree was rooted to C. theobromicola (CBS 124945). The bar indicates 0.02 expected changes per site. Coloured blocks are used to indicate clades containing isolates from chili

Fig. 4

Phylogenetic analysis of Colletotrichum isolates in the gloeosporioides complex based on a 50% majority rule consensus tree derived from Bayesian analysis of the combined the ITS, tub2, gapdh, chs-1 and act sequence. The parsimony bootstrap support values (MP > 49%) and Bayesian posterior probabilities (PP > 0.90) are displayed at the nodes (MP/PP). The tree was rooted to C. theobromicola (CBS 124945). The scale bar indicates 0.009 expected changes per site. Coloured blocks are used to indicate clades containing isolates from chili

The analysis using the ApMat and gs sequence alignment comprised of 92 isolates with C. theobromicola CBS 124945 as the outgroup (Fig. 3) and 1824 characters including the alignment gaps and excluded characters. The Bayesian analysis of the combined alignment, based on 952 unique site patterns (ApMat: 520, gs: 432) lasted 29,500,000 generations, resulting in 590,002 total trees, of which 442,502 trees were used to calculate the posterior probabilities. The parsimony analysis yielded 161 equally most parsimonious trees. Bootstrap support values of the MP analysis (MP > 49%) and the BI posterior probabilities (PP > 0.90) were plotted at the nodes (Fig. 3). Overall, the species clades recognised in this study received similar support values, except for the C. siamense clade (MP = 92% / PP < 0.91).

Phylogenetic analyses of the gloeosporioides species complex identified 69% (29) of the chili fruit isolates as C. siamense. In the 2-gene tree a distinct subclade within the C. siamense clade formed with 100% bootstrap support which contained isolates from Chiang Mai in Thailand, and Gowa and Jeneponto in South Sulawesi of Indonesia (Fig. 3). These isolates from Indonesia and Thailand had very distinct sequences compared to the ex-type reference C. siamense strain (CBS 130417) with 28 bp difference in the gs gene and 25 bp difference in the ApMat gene. A significant sub-clade formed within C. siamense with full (100% BS/1 PP) support values in the 2-gene tree. The same isolates in the 5-gene tree did not show the same level of difference but showed a strong similarity between the C. siamense isolates. In the 2-gene tree there were also significant subclades of isolates associated with different geographical regions, in particular the distinct subclade of the Sri Lankan isolates (UOM 1116, UOM 1117, UOM 1118) from Kandy and the separate subclade of Thai isolates from Ratchaburi (UOM 1132, UOM 1133, UOM 1134).

Other species identified in the gloeosporioides complex included C. endophyticum and C. fructicola from Thailand, C. fructicola and C. tainanense sp. nov. from Taiwan, and C. tropicale and C. makassarense sp. nov. from Indonesia. Most of the identified species including the two new species were supported in distinct clades with significant bootstrap values in both the 5-gene and 2-gene trees (Figs. 3 and 4). However, due to a lack of sequence data of the ApMat gene for some reference strains, it was difficult to provide a good support for placement of some species such as C. endophyticum in the 2-gene trees. Three isolates (CPC 28607, UOM 1002, UOM 1003) collected from the Makassar region in Indonesia showed a close relationship to the reference species C. tropicale in the ApMat and gs tree (Fig. 3). Individual gene trees of ITS, act, tub2, chs-1 loci (data not shown) also supported these isolates as C. tropicale. Nevertheless, in the 5-gene tree a separate sub clade was formed with full support (100% BS/1 PP) different to the C. tropicale reference species (Fig. 4). In both trees, two isolates (UOM 1120, UOM 1119) collected from Tainan in Taiwan formed a significant distinct clade with full support (100% BS/1 PP) separate from C. salsolae.

Orchidearum complex

For the six isolates and nine reference species in the orchidearum complex the phylogenetic analysis of the combined data sets using four genes (ITS, gapdh, tub2 and act) with C dracaenophilum (CBS 118199) as the outgroup comprised 26 isolates and 1543 characters including the alignment gaps and excluded characters. The Bayesian analysis of the combined alignment, based on 221 unique site patterns (ITS: 34, gapdh: 55, act: 42, tub2: 90) lasted 275,000 generations, resulting in 5502 total trees of which 4128 trees were used to calculate the posterior probabilities. The parsimony analysis yielded 284 equally most parsimonious trees. Bootstrap support values of the MP analysis (MP > 49%) and the BI posterior probabilities (PP > 0.90) were plotted at the nodes (Fig. 5). Overall, the species clades recognised in this study received similar support values, except for the C. plurivorum clade (MP = 64% / PP <  1) and the C. cliviicola clade (MP = 87% / PP <  1).

Fig. 5

First of 284 equally most parsimonious trees obtained from a heuristic search of the combined ITS, tub2, gapdh, chs-1, and act sequence alignment of the Colletotrichum isolates in the orchidearum complex. The parsimony bootstrap support values (MP > 49%) and Bayesian posterior probabilities (PP > 0.90) are displayed at the nodes (MP/PP). The tree was rooted to C. dracaenophilum (CBS 118199). The scale bar indicates 20 changes. Coloured blocks are used to indicate clades containing isolates from chili

The phylogenetic analyses identified the isolates from Thailand and Malaysia as C. plurivorum. Five isolates collected from Thailand, including three taken from infected chili leaves from Chiang Rai and another two isolates collected from infected green chili fruit from Bangkok, formed a poorly supported subclade within C. plurivorum (Fig. 5).

TAXONOMY

Morphological observations and phylogenetic data of the straight conidia species clearly identified three novel species, two from Indonesia and one from Taiwan. Detailed morphological descriptions are provided below for all the Colletotrichum species associated with chili anthracnose (Table 4).

Table 4

Morphological characteristics of Colletotrichum species causing anthracnose of chili

Species	Conidiogenous cells length (μm)	Conidia length (μm)	Conidia width (μm)	Appressoria (μm)
C. endophyticum	12–21 × 3–4	(10.4–)12.5–13(−14.5)	(3–)4.5–5(−6.3)	(10.5–)12(−15) × (3–)4.5(−10)
C. fructicola	7–17.5	(10.5–)12.5–13(−18.5)	(3–) 4–5.5(−6.5)	–
C. javanense	7–17.5	(11.5–)13.5–14(−15.8)	(2.4–)3.5–4(−4.3)	(6–)8.2(−11.3) × (4.2–)5.6(−7.5)
C. karsti	–	(11.6–)12.5–13(−15.7)	(3–)4–5.2(−6.5)	6–12.5 × 3.5–8.2
C. makassarense	7–25 × 3–4	(11–)13–15(−17)	(4–)4.5–5	(6–)8(−10.5) × (4–)3.5(−8.6)
C. plurivorum	26–48 × 3–4	(13.7–)14–16(− 18.3)	(3.8–)5(−5.6)	(10.5–)12(−23) × (3.5–)5.5(− 11.5)
C. scovillei	7–17.5	(5.5–)9.5–10(−12)	(2.4–)3(−3.8)	(4–)5.5(−12.5) × (3.5–)4.5–5(− 6.5)
C. siamense	6.5–16	(13–)14(− 15.5)	(3–)4.2(−5.3)	(4.5–)7.5(− 10) × (3.5–)3(−5.5)
C. tainanense	–	(16–)17–18(−22)	(4.5–)5	(6.5–)10.3(− 14.3) × (6.2–)5.2(−9.5)
C. tropicale	7–15 × 3.5–4.5	(13–)14–16(− 17)	(3.5–)4–5(− 6)	–

Colletotrichum javanense D.D. De Silva, P.W. Crous & P.W.J. Taylor, sp. nov. MycoBank MB826936.

Figure 6 Etymology: Named after Java, the island in Indonesia where the species was collected.

Diagnosis: Colletotrichum javanense differs from C. brisbanense in forming distinct chlamydospores and acervular conidiomata on all the media tested. In contrast, C. brisbanense only produced Conidiomata on Anthriscus stem, but no basal cells observed. In addition, C. javanense grows faster than C. brisbanense (C. javanense on OA, MEA and SNA 60, 55 and 66 mm diam in 7 d, respectively, C. brisbanense on OA and SNA 18.5, 20 mm diam in 7 d, respectively). Colletotrichum javanense is phylogenetically distinct to C. brisbanense with both species being different in the sequences of chs-1, and most effectively with gapdh (7 bp difference) and his3 (4 bp difference).

Type: Indonesia: West Java, Purwakata regency, on fruit of Capsicum annuum, Dec. 2014, F. Fitriyah (CBS H-144963 – holotype; CBS 144963 = UOM 1115 = EWINDO 3 – ex-type cultures).

Description: Sexual morph not observed. Asexual morph on PDA. Vegetative mycelium 1–5 μm diam, hyaline, smooth-walled, septate, branched hyphae. Chlamydospores globose or elongate, pale brown, smooth-walled, 5–25 × 3–8 μm. Conidiomata acervular, setae not observed. Conidiophores hyaline, septate, branched. Conidiogenous cells hyaline, cylindrical or ampulliform, 7–17.5 μm, apex 1–3 μm diam. Conidia hyaline, aseptate, smooth-walled, mostly fusiform, one end rounded, the other end acute, or both ends acute (11.5–)13.5–14(− 16) × (2.5–) 4(− 4.5) μm. Conidia in mass yellow to orange colour. Appressoria single or in loose groups, medium brown, smooth-walled, subglobose or elliptical, with entire or undulate margin, (6–)8(− 11.5) × (4–)6(− 7.5) μm.

Asexual morph on SNA. Vegetative mycelium 1–7 μm diam, hyaline, smooth-walled, septate, branched hyphae. Chlamydospores globose or elongate, pale brown, smooth-walled, 4.5–28 × 4–8 μm. Conidiomata acervular, setae not observed. Conidiophores hyaline, septate, branched, 20–35 μm long. Conidiogenous cells hyaline, cylindrical or ampulliform, 5–20 μm, apex, 1–3 μm diam. Conidia hyaline, aseptate, smooth-walled, cylindrical with both ends acute or one end round and one end acute, (13.5–)16.5(− 24) × (2.5–) 3(− 4.5) μm. Conidia in mass with yellow to orange colour.

Culture characteristics: Colonies on PDA 48–54 mm diam in 7 d (6.5–7.5 mm/d), flat with entire margin; surface covered with grey to olive-green short aerial mycelium, margin white to light grey, reverse mostly cream whitish, olivaceous grey to black in the centre. Yellow to orange acervular conidiomata. Colonies on SNA were 60–66 mm diam in 7 d (8–9.5 mm/d), flat with entire margin, hyaline to pale brown, surface covered with short grey aerial mycelium, reverse same colours. Orange acervular conidiomata at the centre of the culture. Colonies on OA were 55–60 mm diam in 7 d (7.8–8.5 mm/d), flat with entire margin; surface covered with cream to grey short aerial mycelium, margin white, reverse mostly light orange, with brown pigments. Orange acervular conidiomata. Colonies on MEA surface pale grey short aerial mycelium, reverse light orange.

Notes: The closest match in a blastn search with the gapdh sequence was GenBank JQ948617, C. sloanei strain IMI 364297 with 98% identity (4 bp differences), while the closest matches with the his3 sequence with 99% identity (2 bp differences) were GenBank JQ949279 C. indonesiense strain CBS 127551 and GenBank KJ947248 C. guajavae isolate OBP19.

Colletotrichum makassarense D.D. De Silva, P.W. Crous & P.W.J. Taylor, sp. nov. MycoBank MB827691.

Figure 7 Etymology: Named after Makassar, the city in South Sulawesi, Indonesia, where the species was collected.

Fig. 7

Colletotrichum makassarense (CBS 143664). a Colony on PDA. b Reverse side of the colony on PDA. c Conidiomata. d–e Appressoria. f Setae, g, h, j Conidiophores and conidia. i Conidia. Bars = 10 μm

Diagnosis: Colletotrichum makassarense is phylogenetically closely related to C. tropicale. Sequence data from ITS could not separate the two species, but they can be distinguished by all other genes tested and most effectively using ApMat (22 bp differences) and gs (18 bp differences) sequence data.

Type: Indonesia: Makassar, from fruit lesion of Capsicum annuum, 7 Jun. 2015, P.W.J. Taylor & A. Nasruddin (CBS H-143664 – holotype; CBS 143664 = CPC 28612 – ex-type cultures).

Description: Sexual morph not observed. Asexual morph on OA. Vegetative mycelium consisting of hyaline, smooth-walled, septate, branched hyphae, 2–3 μm diam. Chlamydospores not observed. Setae present, medium brown, 40–55 × 3–5 μm, 2–3-septate, tapering to acute apices. Conidiomata acervular, 100–200 μm diam, with orange conidial masses. Conidiophores subcylindrical, flexuous, 1–4-septate, hyaline, smooth, branched, 15–45 × 3–4 μm. Conidiogenous cells subcylindrical, hyaline, smooth, phialidic with periclinal thickening, 7–25 × 3–4 μm. Conidia hyaline, smooth, aseptate, subcylindrical, straight, apex obtuse, tapering at base to protruding truncate hilum, 1 μm diam, prominently guttulate, (11–)13–15(− 17) × (4–)4.5–5 μm. Appressoria solitary, medium brown, smooth-walled, subglobose, ellipsoidal to obovate, entire margin, (6–)8.0(− 10.5) × (4–)3.5(− 8.5) μm.

Culture characteristics: Colonies on PDA 45 mm diam after 7 d (6.5 mm/d), colonies flat, with moderate aerial mycelium, on OA surface smoke-grey. On PDA surface smoke-grey, reverse olivaceous grey. On MEA surface dirty white, reverse ochreous.

Notes: The closest match in a blastn search with the ApMat sequence was GenBank KU923732, C. queenslandicum strain AUS22 with a 98% identity (16 bp differences), while the closest match with the gs sequence with 99% identity (7 bp differences) was GenBank KJ947286 C. siamense isolate OBP24. The best matches with the gapdh sequence were GenBank KX578784 C. siamense (99% identity, 3 bp differences) and GenBank KU221347 C. queenslandicum (99%, identity, 3 bp differences).

Colletotrichum tainanense D.D. De Silva, P.W. Crous & P.W.J. Taylor, sp. nov. MycoBank MB827692.

Figure 8 Etymology: Named after Tainan, the city in Taiwan where the species was collected.

Fig. 8

Colletotrichum tainanense (CBS 143666). a Colony on PDA. b Reverse side of the colony on PDA. c Conidia. d-e Conidiophores and Conidia. f Melanised hypae g-j Appressoria. Bars = 10 μm

Diagnosis: Colletotrichum tainanense differs from its closest phylogenetic neighbour C. salsolae in the culture characteristics on PDA, sparse aerial mycelium and pale mouse-grey surface mycelium, whereas C. salsolae produces a layer of acervuli-like structures with deep orange brown conidial masses and numerous setae. The two species are separable using all the genes tested except for ITS and most effectively with gapdh (7 bp difference), tub2 (6 bp difference) and act (5 bp difference) sequences. There is only one bp difference in the chs-1 sequence between the two species.

Type: Taiwan: Tainan: on fruit of Capsicum annuum, Aug. 2014, Z.M. Sheu (CBS H-143666 – holotype; CBS 143666 = CPC 30245 = UOM 1120 = Coll 1298 – ex-type cultures).

Description: Sexual morph not observed. Asexual morph on PDA. Vegetative mycelium branched, hyaline, smooth-walled, septate, hyphae 2–3 μm diam, melanised with time. A single conidioma found on a PDA plate, sterile on SNA, MEA, and OA. Chlamydospores and setae not observed. Conidiophores subcylindrical, flexuous, 1–2-septate, hyaline, smooth to pale brown, branched. Conidiogenous cells subcylindrical, hyaline, smooth, phialidic with periclinal thickening. Conidia hyaline, smooth, aseptate, subcylindrical to subclavate, straight or slightly curved, apex obtuse, tapering at base to protruding truncate hilum, 1.5–2 μm diam, prominently guttulate, (16–)17–18(− 22) × (4.5–)5 μm. Appressoria single or in loose groups, often narrow-cylindric, medium to dark brown, often tapering towards apex, the edge entire or undulate sometimes irregularly lobed (6.5–)10.5(− 14.5) × (6–)5(− 9.5) μm.

Culture characteristics: Colonies on PDA 45 mm diam after 7 d (6.5 mm/d), colonies flat, with moderate aerial mycelium. On OA surface pale mouse-grey. On PDA surface pale mouse-grey, reverse mouse-grey. On MEA surface pale mouse-grey, reverse olivaceous grey.

Notes: The closest match in a blastn search with the gapdh sequence with 99% identity (2 bp difference) was GenBank KC790761 Colletotrichum sp. strain MTCC 9664 while the closest match with the act sequence with 99% identity (2 bp difference) was GenBank KY995522 C. siamense strain LJDY1–2. The closest match with the tub2 sequence with 99% identity (7 bp difference) was GenBank MF143931 C. siamense strain 31-B-1.

Colletotrichum endophyticum Manamgoda et al., Fung. Diversity 61: 112 (2013); as ‘endophytica’.

Description: Colonies on PDA 42 mm diam after 7 d (5.5 mm/d), pale orange to white aerial mycelium; reverse pale white to orange and black at the centre and numerous orange conidiomata scattered over the surface. Chlamydospores not observed. Conidiomata present, conidiophores formed directly on hyphae. Setae present, moderately brown, 47–95 × 3–6 μm, 3–4-septate, tapering acute apices. Conidiophores hyaline, smooth-walled and unbranched. Conidiogenous cells hyaline, smooth-walled, aseptate, subcylindrical, 12–21 × 3–4 μm. Conidia hyaline, smooth-walled, aseptate, straight, cylindrical with two ends obtuse, (10.5–)12.5–13(− 14.5) × (3–)4.5–5(− 6.5) μm. Appressoria single or in loose groups, brown, slightly lobed, (10.5–)12(− 15) × (3–)4.5(− 10) μm.

Notes: Colletotrichum endophyticum was first described as a grass endophyte of Pennisetum purpureum from northern Thailand (Manamgoda et al. 2013). Later, it was reported from several other host species including Capsicum in China (Diao et al. 2017). The length of conidia of the isolate from Thailand (UOM 1137) was slightly shorter than that of the ex-type (LC0324) of C. endophyticum (conidia 13–19(− 21) × (3.5–)4.5–5.5 μm).

Material examined: Thailand: Kanchanaburi: from fruit lesion of Capsicum annuum, 2010, P.W.J. Taylor & O. Mongkolporn (culture UOM 1137 = F5-2D).

Colletotrichum fructicola Prihast. et al., Fung. Diversity 39: 158 (2009).

Description: Colonies on PDA 65 mm diam after 7 d (8.5–11 mm/d), flat with entire edge, aerial mycelium dense, cottony, pale grey to white aerial mycelium and numerous black stroma scattered over the surface, grey in the centre, white at the margin; reverse greyish green. Chlamydospores not observed. Conidiomata acervular, Setae was observed, brown, smooth-walled, 1–2-septate, 60 μm long, tapering acute apices. Conidiophores hyaline, septate, branched. Conidiogenous cells hyaline, cylindrical or ampulliform, 7–17.5 μm. Conidia hyaline, aseptate, smooth-walled, cylindrical, both ends obtuse, (10.5–)12.5–13(− 18.5) × (3–) 4–5.5(− 6.5). Appressoria not observed.

Notes: The sexual morph of these isolates was not observed in culture. Conidial length of isolate CPC 28644 was slightly longer than that of the ex-type (ICMP 18581 = BPD-I16) of C. fructicola (conidia 9.7–14 × 3–4.3 μm, x = 11.53 ± 1.03 × 3.55 ± 0.32 μm; Prihastuti et al. 2009).

Material examined: Thailand: Chiang Mai: from fruit lesion of Capsicum annuum, 7 Jun. 2015, P.W.J. Taylor & O. Mongkolporn (cultures CPC 28644 and CPC 28645). Taiwan: Cyonglin, Hsinchu, from fruit lesion of mature red fruit of Capsicum sp. (sweet pepper), 22 Apr. 2015, Z.M. Sheu (culture UOM 1139 = coll 1318); Nantou, Renai, from fruit lesion of green fruit of Capsicum sp. (sweet pepper), 4 Sep. 2008, Z.M. Sheu & C. Wang (culture UOM 1138 = coll-853).

Colletotrichum karsti You L. Yang et al. Cryptogamie, Mycologie 32: 241 (2011); as ‘karstii’.

Description: Colonies on PDA 65 mm diam after 7 d (6.5–10.5 mm/d), flat with entire edge, orange to white aerial mycelium and numerous orange conidial masses scattered over the surface, white at the margin; reverse yellow to orange. Chlamydospores not observed. Conidiomata acervular, setae were observed, brown, smooth-walled, 2–4-septate, 60 μm long, base submerged, tapered towards apex, tip mostly acute. Conidiophores hyaline, septate, branched, (10.5–)12–38(− 47.5) × (3–)4–5.5(− 6.5) μm. Conidiogenous cells hyaline, cylindrical or ampulliform, 7–15.5 μm. Conidia hyaline, aseptate, smooth-walled, short, cylindrical, both ends obtuse or one end slightly acute or truncate at the base, (11.5–)12.5–13(− 15.5) × (3–)4–5(− 6.5) μm. Appressoria single or in loose groups, brown, subglobose, circular outline, 6–12.5 × 3.5–8 μm.

Notes: The four isolates identified from Indonesia in the boninense complex produced distinct short conidia compared to the ex-epitype culture of C. karsti (14.5–17 × 5–6.5 μm; Yang et al. 2011). However, high variability of conidia size between different strains of C. karsti were reported by Damm et al. (2012a, 2012b) where the conidia measurements of CBS 129833 were (11.5–)12.5–14(− 14.5) × (5–)5.5–6(− 6.5) μm, mean ± SD = 13.1 ± 0.7 × 5.8 ± 0.4 μm; and CBS 111998 had a conidium length up to 18.5 μm, L/W ratio = 2.8. These isolates did not form a sexual morph in culture. Although these four isolates formed a fully supported (100% BS/1 PP) subclade within C. karsti, all the individual gene trees (data not shown) did not provide significant support to justify introducing a cryptic species for these isolates.

Material examined: Indonesia: Jeneponto, from fruit lesions of Capsicum annuum, 7 Jun. 2015, P.W.J. Taylor & A. Nasruddin (cultures CPC 28553, CPC 28554); from fruit lesion of mature red fruit and peduncle lesions of Capsicum sp. Jun. 2015, P.W.J. Taylor & A. Nasruddin (cultures CPC 28601, CPC 28602).

Colletotrichum plurivorum Damm et al., Stud. Mycol. 92: 31 (2019).

Description: Colonies on PDA 63 mm diam after 7 d (8 mm/d), grey to dark brown aerial mycelium; reverse grey to light brown with yellow-orange in the centre with abundant acervular conidiomata that ooze pale orange conidial masses at the centre, Chlamydospores not observed. Conidiomata present (near the inoculation point), conidiophores formed directly on hyphae. Sclerotia present. Setae present, medium brown, 94–125 × 4–6 μm, 1–4-septate, tapering towards acute apices, often with a constriction at the apex. Conidiophores hyaline to pale brown, smooth-walled, septate and branched. Conidiogenous cells hyaline, smooth-walled, aseptate, subcylindrical, straight to gently curved, 26–48 × 3–4 μm, phialidic, periclinal thickening conspicuous. Conidia hyaline, smooth-walled, aseptate, straight, cylindrical with two ends obtuse or one end slightly acute, (13.5–)14–16(− 18.5) × (4–)5(− 6.5) μm. Appressoria single or in loose groups, medium brown, irregular in shape, crenate or lobed outline, (10.5–)12(− 23) × (3.5–)5.5(− 11.5) μm. Sexual morph on PDA. Ascomata perithecia, formed after 2 wk., solitary, semi-immersed or immersed in the agar medium, nonstromatic, subspherical to ovoid, ostiolate, glabrous, medium brown, 96–130 × 160–200 μm. Peridium 10–12.5 μm thick, composed of pale to medium brown flattened angular cells 3.5–10 μm diam. Ascogenous hyphae hyaline, smooth-walled, delicate, rarely visible. Interascal tissue not observed. Asci unitunicate, 8-spored, cylindrical, tapering to apex and base, smooth-walled, 51–65 × 9.5–13 μm, the base truncate. Ascospores biseriately arranged, aseptate, hyaline, smooth-walled, fusiform, slightly curved, base rounded, apex acute or rounded, (13.5–)15–18(− 22) × 5–6(− 6.5) μm,

Notes: The conidial length of the isolates examined (CPC 28638, CPC 28639) was variable and fell within the range of the ex-type isolate (CBS 125474) of C. plurivorum (15–17 × 5.5 μm; Damm et al. 2019).

Material examined: Thailand: Chiang Rai, from leaf lesions of Capsicum annuum, 7 Jun. 2015, P.W.J. Taylor (cultures CPC 28638 and CPC 28639); Bangkok, restaurant in Phaya Thai area, infected tissue of Capsicum sp. Jun. 2015, P.W.J. Taylor (culture UOM 1004).

Colletotrichum scovillei Damm et al., Stud. Mycol. 73: 100 (2012).

Decription: Colonies on PDA 20–38 mm diam after 7 d (5–6.2 mm/d), flat with entire margin; surface covered with short light pink to orange aerial mycelium, turn grey with time, margin whitish to pale pink, reverse rosy buff, olivaceous grey to brown-grey in the centre; reverse orange to salmon, dark at the centre. Chlamydospores not observed. Conidiomata acervular, setae not observed, Conidiophores hyaline, septate, branched. Conidiogenous cells hyaline, cylindrical or ampulliform, 7–17.5 μm, apex 1–3 μm diam. Conidia hyaline, aseptate, smooth-walled, mostely fusiform, one end rounded, one end acute, (5.5–)9.5–10(− 12) × (2.5–)3(− 4). Conidia in mass with salmon to orange colour. Appressoria single or in loose groups, medium brown, ovoid, entire to crenate margin, (4–)5.5(− 12.5) × (3.5–)4.5–5(− 6.5) μm.

Notes: The majority of isolates identified as C. scovillei had similar spore shape and spore sizes, compared to the type specimen (10.5–)12.5–15(− 16.5) × (3–)3.5–4(− 4.5) μm, described by Damm et al. (2012a, 2012b). However, some isolates had varying colony colour, different colony growth rates and small differences in spore measurements.

Material examined: Indonesia: Gowa, from fruit lesions of Capsicum annuum, 7 Jun. 2015, P.W.J. Taylor & A. Nasruddin (cultures CPC 28577 and CPC 28579); West Java: from fruit lesion of Capsicum annuum, Dec. 2014, F. Fitriyah, UOM 1146/ EWINDO 10. Thailand: Chiang Mai: from fruit lesions of Capsicum sp. 2008, O. Mongkolporn (cultures UOM 1101/313, UOM 1111).

Colletotrichum siamense Prihast. et al., Fung. Diversity 39: 98 (2009)

Description: Colonies on PDA 79 mm diam in 7 d (5.5–6 mm/d). Pale yellow-white, grey, dense cottony aerial mycelium with orange acervular conidiomata at the centre; reverse pale yellowish. Chlamydospores not observed. Conidiomata acervular, conidiophores formed on a cushion of roundish and medium brown cells. Setae not observed. Conidiophores hyaline, branched. Conidiogenous cells hyaline, cylindrical to ampulliform, 6.5–16 μm. Conidia hyaline, aseptate, smooth-walled, fusiform to cylindrical, both ends bluntly rounded, (13–)14(− 15.5) × (3–)4(− 5.5) μm. Appressoria dark brown, solitary, circular, entire to crenate margin, (4.5–)7.5(− 10) × (3.5–)3(− 5.5) μm.

Notes: Colletotrichum siamense isolates from different countries showed variation of morphological characters, in growth rates and culture morphology on PDA. Representative conidial measurements for isolates representing different subclades in the phylogenetic trees (Figs. 2, 3) are: CPC 30233 (Gowa, Indonesia), 12.5–17 × 2.5–5.5 μm; UOM 1132 (Ratchaburi, Thailand) 9.5–14.5 × 3.5–5 μm; UOM 1126/ F4-1C (Kanchana Buri, Thailand) 12–15 × 5–7 μm; UOM 1116 (Kandy, Sri Lanka) 10.5–16.5 × 3.5–5.5. These morphological characters within a subclade were highly consistent within each country. The species was described by Prihastuti et al. (2009); conidia of the ex-holotype specimen (ICMP 18578/ BDP-I2) were reported as 7–18.3 × 3–4.3 μm (x = 10.18 ± 1.74 × 3.46 ± 0.36), which encompasses the range observed in our isolates. This species was reported to be biologically and geographically diverse, and is found on many hosts across several tropical and subtropical regions (Weir et al. 2012).

Material examined: Indonesia: Gowa, from fruit lesion of Capsicum annuum, 7 Jun. 2015, P.W.J. Taylor & A. Nasruddin (culture CPC 30233); Jeneponto, from fruit lesion of Capsicum sp. 7 Jun. 2015, P.W.J. Taylor & A. Nasruddin (culture CPC 30209). Thailand: Ratchaburi, from fruit lesion of Capsicum sp., Jan. 2010, P.W.J. Taylor & O. Mongkolporn (culture UOM 1132); Kanchanaburi, from fruit lesion of Capsicum sp. Jan. 2010, P.W.J. Taylor & O. Mongkolporn (culture UOM 1126 = F4-1C). Sri Lanka: Kandy, from fruit lesion of Capsicum sp. Sep. 2013, D.D. De Silva & N. Ranathunge (culture UOM 1116).

Colletotrichum tropicale E.I. Rojas et al., Mycologia 102: 1331 (2010)

Description: Colonies on PDA 45 mm diam in 7 d (6.5 mm/d). Colonies flat, spreading, with moderate aerial mycelium, On OA surface smoke grey. On PDA surface olivaceous grey to smoke grey, reverse olivaceous grey, numerous orange conidiomata scattered over the surface. On MEA surface dirty white, reverse ochreous. Asexual morph on OA. Vegetative mycelium consisting of hyaline to pale brown, smooth-walled, septate, branched, 2–2.5 μm diam hyphae. Chlamydospores not observed. Setae rare (only two seen), straight, medium brown, finely verruculose, 2–3-septate, to 120 μm long, apex subobtusely rounded. Conidiomata acervular, 150–250 μm diam, with orange conidial mass. Conidiophores subcylindrical, flexuous, 1–3-septate, hyaline, smooth, branched, 15–25 × 3.5–4.5 μm. Conidiogenous cells subcylindrical, hyaline, smooth, phialidic with periclinal thickening, 7–15 × 3.5–4.5 μm. Conidia hyaline, smooth, aseptate, subcylindrical, straight, apex obtuse, tapering at base to protruding truncate hilum, 1.5–2 μm diam, prominently guttulate, (13–)14–16(− 17) × (3.5–)4–5(− 6) μm. Appressoria not observed. Sexual morph not observed.

Material examined: Indonesia, Makassar, from fruit lesion of Capsicum annuum, 7 Jun. 2015, P.W.J. Taylor & A. Nasruddin (culture CPC 28607).

Prevalence of sampled Colletotrichum species

Overall, C. truncatum was the most prevalent species (44%) isolated from infected chili fruit (Fig. 9) and was readily identified by its falcate spores and abundant setae in the necrotic lesions. Of the species with straight conidia, C. scovillei (acutatum complex), was the most common species throughout the surveyed countries (35%), except for Sri Lanka where this species was not isolated. Colletotrichum siamense (gloeosporioides complex) was the next most common species that occurred in Thailand, Sri Lanka and Indonesia (11%). The remaining species were represented by fewer than 10% of the total number of isolates.

Fig. 9

Prevalence of Colletotrichum species as a percentage of the total isolates collected in all regions and in Indonesia and Thailand specifically

In Indonesia, C. scovillei was isolated from infected chili fruit in all surveyed regencies of South Sulawesi, except in Makassar, and in the field trial site in West Java. Colletotrichum siamense was also isolated from throughout the region, from Gowa, Jeneponto and Makassar. The two new species, C. makassarense and C. javanense were isolated from Makassar and West Java, respectively.

In Thailand, C. scovillei was isolated mostly from the northern provinces of Chiang Mai and Chiang Rai, but was also obtained from infected chili fruit in a trial site of Kasetsart University in Nakhon Pathom. The Western provinces had a high incidence of C. siamense and one isolate of C. endophyticum was collected from Kanchana Buri. Colletotrichum plurivorum was isolated from chili leaves with necrotic lesions in Chiang Rai and from necrotic lesions of chili fruit found in a restaurant in Phaya Thai area of Bangkok. In addition, C. fructicola was identified from fruit collected from Chiang Mai.

In Taiwan, an isolate was identified as a new species, C. tainanense, collected from infected chili fruit in the Tainan province, and C. fructicola was identified from fruit in Hsinchu and Nantou, Taiwan. Colletotrichum plurivorum was also identified from a fruit collected in Johor, Malaysia.

Pathogenicity

All the Colletotrichum species caused anthracnose symptoms on wounded fruit, but there were significant differences in severity of the symptoms. On wounded fruit, isolates of C. scovillei and C. javanense showed the highest disease severity, producing large, necrotic lesions with mean lesion sizes 15.6–20.3 mm (Table 5). On non-wounded fruits, all species were less pathogenic, with mean lesion sizes less than 10 mm. Colletotrichum makassarense, C. tropicale and C. plurivorum, produced only very small lesions or no visible symptoms (mean lesion size < 1 mm) 10 d after inoculation of non-wounded fruits. Colletotrichum javanense and C. scovillei isolates were the most pathogenic in non-wounded fruit and produced lesions with mean sizes of 9.4 and 9.1 mm respectively. Lesions caused by C. scovillei were significantly larger than those caused by all other species except for C. javanense in wounded fruit and C. endophyticum in unwounded fruit. Significance of the pairwise t-tests is strongly dependent on the number of isolates of each species sampled, so the groupings shown in Table 5 do not simply change with the magnitude of the difference of the means; a large difference may not be significant if there are small sample sizes for both species while a smaller difference may be significant. In particular, comparisons involving C. javanense and C. endophyticum are very imprecise as only one isolate of each species was tested.

Table 5

Mean lesion size of symptoms caused by Colletotrichum species with straight conidia on inoculated mature red fruit of Capsicum annuum cv. Bangchang

Wound inoculation				Non-wound inoculation
Species	Least squares mean mm	Standard Error	t-groupinga	Species	Least squares mean mm	Standard Error	t-groupinga
C. scovillei	20.3	0.09	a	C. javanense	9.4	0.28	ab
C. javanense	15.6	0.35	ab	C. scovillei	9.1	0.07	a
C. siamense	9.7	0.11	bc	C. fructicola	3.6	0.2	bc
C. karsti	9.4	0.2	bcd	C. endophyticum	2.8	0.29	bc
C. fructicola	7.8	0.25	be	C. karsti	2	0.16	c
C. tainanense	6.9	0.25	be	C. tainanense	1.5	0.2	c
C. makassarense	6.4	0.18	ce	C. siamense	1.3	0.09	c
C. plurivorum	5.3	0.16	de	C. makassarense	<  1.0	0.14	c
C. endophyticum	4.4	0.35	ce	C. tropicale	<  1.0	0.16	c
C. tropicale	4.1	0.2	de	C. plurivorum	<  1.0	0.13	c
control	0	0.35	e	control	0	0.29	c

aPairwise t-tests between species least square means, significant differences at alpha = 0.05 level are indicated by different letters

DISCUSSION

Colletotrichum isolates collected from infected fruit and leaf tissue of chili plants from Thailand, Indonesia, Taiwan, Sri Lanka, and Malaysia were allocated to different species complexes with 11 Colletotrichum species being identified and three new species described.

Colletotrichum truncatum was the most prevalent species of Colletotrichum causing anthracnose of chili in Asia, which supports previous reports of C. truncatum being widely distributed on chili fruit throughout Asia, Australia, and South America (Sharma et al. 2014; De Silva et al. 2017a; Diao et al. 2017; Mongkolporn and Taylor 2018). Colletotrichum truncatum has a broad host range infecting many crop species (https://nt.ars-grin.gov/fungaldatabases/; Ranathunge and Hewa Bajjamage 2016).

The remaining 56% of isolates with straight conidia belonged to the gloeosporioides, acutatum, boninense and orchidearum species complexes. Of these, C. scovillei, in the acutatum complex, was the most prominent species (35% of the total isolates) and was distributed in Indonesia, Malaysia, Thailand and Taiwan. However, C. scovillei was not identified in the survey of Sri Lanka, possibly because of the small number of samples assessed. Previous studies have also reported the predominance of C. scovillei in Asia and Brazil (Diao et al. 2017, Mongkolporn and Taylor 2018), but this species has not been identified in Australia (De Silva et al. 2017a) and hence remains an important biosecurity threat to the Australian capsicum/chili industry. Further surveys are required to confirm the presence of C. scovillei in Australia and Sri Lanka.

Colletotrichum siamense, in the gloeosporioides complex, was also prominent (11% of total isolates) in causing anthracnose of chili fruit in Indonesia, Sri Lanka and Thailand, but was not detected in Malaysia and Taiwan. Nevertheless, Noor and Zakaria (2018) reported the identification of C. siamense in Malaysia possibly due to a larger sampling size of infected chili across states in Malaysia. Within the C. siamense clade, small subclades were observed that coincided with different geographical regions from where the isolates were collected. Colletotrichum siamense has been reported to infect chili in Asia, Australia, Brazil, and is a common pathogen of many other plant species (Weir et al. 2012; James et al. 2014; Sharma and Shenoy 2014; Liu et al. 2016a, 2016b; de Oliveira et al. 2017; De Silva et al. 2017a; Diao et al. 2017; Suwannarat et al. 2017).

Colletotrichum siamense isolates from different countries appeared to show different morphological characters with varying growth rates and culture morphologies. This variability in morphological characters indicated that this taxon has high intra-specific diversity. The combined gene analyses of ApMat and gs sequences also supported the distinction of subclades within the C. siamense clade. In the last few years, there has been significant debate on whether C. siamense s. lat. should be separated into different species groups within the gloeosporioides complex, with the number of accepted species ranging from one to seven (Weir et al. 2012; Udayanga et al. 2013). However, a recent case study concluded that C. siamense s. lat. was a single species rather than a species complex as no independent evolutionary lineages were found within this species (Liu et al. 2016a).

Colletotrichum tropicale is reported for the first time as causing anthracnose in Capsicum in Indonesia. Rojas et al. (2010) noted that C. tropicale was initially isolated from a wide range of hosts in forests in tropical America, from rotting fruit and as a leaf endophyte. Silva et al. (2017) recently reported C. tropicale causing chili anthracnose in Brazil. Colletotrichum tropicale was also reported from Japan, Panama, Thailand, and from other host species (Mongkolporn and Taylor 2018).

Colletotrichum fructicola is reported for the first time causing chili anthracnose in Thailand and Taiwan. Colletotrichum fructicola was previously reported to cause anthracnose in chili from India and China (Sharma and Shenoy 2014; Diao et al. 2017). Prihastuti et al. (2009) originally isolated C. fructicola from coffee berries in Thailand, and then C. fructicola was reported as a leaf endophyte from several plants in South America (Weir et al. 2012; Vieira et al. 2014) Colletotrichum fructicola has a wide host range and was reported by Weir et al. (2012) as a biologically and geographically diverse species.

All the species in the gloeosporioides complex were identified using combined multi-locus gene analyses, based on the ITS, gapdh, chs-1, act and tub2 genes, which showed higher diversity on chili than those in the acutatum, boninense and orchidearum species complexes. Phylogenetic tree provided good resolution of the species with high support values, which supported the species boundaries and identified the novel species.

Phylogenetic trees built from ApMat and gs gene sequences had similar topologies to the multigene phylogenetic tree confirming that the ApMat and gs loci were highly informative and that they distinguished most species in the gloeosporioides species complex (Silva et al. 2012; Sharma et al. 2013; Liu et al. 2015). However, some recent new species (Diao et al. 2017; Marin-Felix et al. 2017) were unable to be placed in the ApMat and gs phylogenetic tree due to the absence of the ApMat gene sequence data. Although there were reports that the gs gene alone is not a good marker for differentiating C. siamense isolates (Weir et al. 2012), these data showed multiple base pair differences in gene sequences of the gs loci of C. siamense species similar to the ApMat locus. In addition, the lack of noticeable subclading in C. siamense in the 5-gene tree compared to the ApMat and gs tree, confirmed that the ApMat and gs loci were more informative than the other five gene loci. The ApMat gene has been shown previously to improve the systematics of the gloeosporioides species complex, providing complementary phylogenetic information compared to other loci (Silva et al. 2012). Liu et al. (2015) also applied the ApMAT gene in a more recent molecular phylogenetic analyses of the species in this complex and discussed the merit of using ApMat and ApMat in combination with gs to resolve the phylogeny.

Although four isolates from Indonesia were identified as C. karsti in the boninense complex, they formed a subclade within the C. karsti species clade and had different conidial sizes to the ex-type strain of C. karsti (Yang et al. 2011), suggesting that these might be a new species. However, sufficient phylogenetic support was not observed in all the individual gene trees to justify the introduction of a novel species. Besides, Damm et al. (2012a, 2012b) reported that the conidium size of C. karsti was quite variable. Colletotrichum karsti has been reported from China and India to cause anthracnose disease in Capsicum spp. (Liu et al. 2016b; Saini et al. 2016; Diao et al. 2017). Colletotrichum karsti has the widest known host range and distribution of all species in the boninense complex (Damm et al. 2012b). Most of the C. karsti strains had been isolated as endophytes but a few were derived from diseased plant tissues. This species has mostly been isolated from dicotyledonous plants, but some have occurred on monocotyledonous families, especially Orchidaceae and Musaceae (Damm et al. 2012b).

Colletotrichum plurivorum was identified for the first time causing anthracnose in Thailand and Malaysia. The five C. plurivorum isolates from chili in Thailand formed a distinct subclade with high support values within the C. plurivorum subclade, and separated from C. cliviicola (syn. C. cliviae, Damm et al. 2019). In addition, the C. plurivorum isolates formed a characteristic sexual morph in culture, which was not reported for C. cliviicola (Yang et al. 2009).

Recently, Damm et al. (2019) resolved the taxonomic placement of several Colletotrichum strains which did not belong to any of the accepted species complexes and assigned them to three new species complexes including the orchidearum complex. Recent studies in China and Brazil also identified multiple species belonging to these complexes, including C. brevisporum, C. cliviicola, C. liaoningense, and C. plurivorum that caused anthracnose disease in chili (Liu et al. 2016b; De Silva et al. 2017b; Diao et al. 2017). Colletotrichum plurivorum belongs to the orchidearum complex with many isolates reported to have a large host range (Damm et al. 2019). The type specimen was described as new from Coffea in Vietnam (Nguyen et al. 2010). Colletotrichum plurivorum was originally described as C. sichuanensis from Capsicum annuum in the Sichuan Province of China (Liu et al. 2016b). However, the name was invalid, because no holotype specimen was cited (Mongkolporn and Taylor 2018; Damm et al. 2019).

Pathogenicity tests of Colletotrichum spp. from chili showed that while all the species were pathogenic on chili fruits after wounding the fruit surface, most produced a low level of infection on non-wounded fruit. This illustrates the importance of the cuticle acting as a barrier to infection by Colletotrichum spp. (Auyong et al. 2015) and emphasises the need for informed and standardised inoculation techniques in pathogenicity assays. Some species such as C. tropicale, C. makassarense and C. plurivorum which produced a low level of infection in the assays on non-wounded fruit, may have a predominantly endophytic lifestyle then switch to a necrotrophic life style to complete their life-cycle (De Silva et al. 2017b). However, further pathogenicity tests on different chili cultivars and at different fruit maturity stages are necessary to comprehensively evaluate their pathogenicity. Pathogenicity testing of C. plurivorum on chili leaves and fruits showed that the isolates collected from Chiang Rai and Malaysia could infect leaves but not fruit (results not shown) and suggested they might be specialised leaf pathogens. In contrast, two isolates of C. plurivorum from Bangkok did not infect leaves but did infect wounded fruits. These results demonstrate the pathogenic variation that can exist within a single species.

Mongkolporn et al. (2010) identified pathotypes of C. truncatum, C. scovillei (as C. acutatum) and C. siamense (as C. gloeosporioides) within isolates of each species from Thailand. Pathotypes were identified by inoculating wounded fruit of Capsicum baccatum and C. chinense genotypes. All the isolates identified as C. gloeosporioides and C. acutatum in Mongkolporn et al. (2010) were subsequently re-identified as C. siamense and C. scovillei, respectively except for isolate UOM 1137 (F5-2D), which was identified as C. endophyticum. The isolate UOM 1137 was pathogenic in both the wound and non-wound bioassays, and was classified in the most virulent C. siamense pathotype group (PCg1-R) in Mongkolporn et al. (2010). This contrasts with the study by Manamgoda et al. (2013) where C. endophyticum was described as an endophyte of Pennisetum purpureum. The severity of infection in chili may indicate that Capsicum annuum was the preferred host for C. endophyticum and P. purpureum was a less favoured host, where the pathogen infected but existed in an endophytic lifestyle. In addition, isolate UOM 1137 also has shorter spores than the type isolate of C. endophyticum, thus further isolates of this species need to be collected from chili plants and P. purpureum in Thailand to confirm taxonomy and pathogenicity.

CONCLUSIONS

Multigene phylogenetic analyses of Colletotrichum species causing anthracnose disease of Capsicum in Asia showed high species diversity with the identification of 11 different Colletotrichum species, including three novel species. Although C. siamense has been reported as infecting many plant species before, this was the first report of C. siamense causing anthracnose in chili in Indonesia and Sri Lanka. This was also the first report of C. fructicola infecting chili in Thailand and Taiwan. In addition, all three novel species were new additions to the Colletotrichum species causing anthracnose in chili. More surveys in countries in Asia and Oceania need to be conducted to identify the diversity and prevalence of species causing chili anthracnose. Understanding of the taxonomy and the pathogenicity of Colletotrichum spp. has great significance to fruit and vegetable industries, where there are serious biosecurity implications of incursion by exotic pathogens.