Tekle Olbamo1,2, Endashaw Esayas3,4, Tizazu Gebre2, Fekadu Massebo2. 1. Department of Animal Science, Jinka University, Jinka, Ethiopia. 2. Department of Biology, Arba Minch University, Arba Minch, Ethiopia. 3. Department of Biology, Arba Minch University, Arba Minch, Ethiopia. esu.endo@gmail.com. 4. Malaria and Neglected Tropical Diseases Research Directorate, Armauer Hansen Research Institute, Addis Ababa, Ethiopia. esu.endo@gmail.com.
Abstract
BACKGROUND: Plant-based mosquito control methods may use as a supplementary malaria vector control strategy. This study aimed to evaluate the effect of smoking ethno-medicinal plants on indoor density and feeding activity of malaria vectors at early hours of the night and its residual effect after midnight in southern Ethiopia. METHODS: Both field and tent trials were conducted to evaluate the impact of smoking Juniperus procera leaves, Eucalyptus globulus seeds and Olea europaea leaves in Kolla Shara Village from July 2016 to February 2017. For the field trial, five grass-thatched traditional huts (three for ethno-medicinal plants and two as control [only charcoal smoking and non-charcoal smoking]) were used. Indoor host-seeking mosquitoes were collected by CDC light traps. A Latin square design was employed to minimize the bias due to the variation in house location and different sampling nights. For the tent experiment, 25 3-5-day-old starved wild female Anopheles mosquitoes reared from the larvae were released into the tents where a calf was tethered at the mid-point of each tent. RESULTS: A total of 614 Anopheles mosquitoes belonging to 5 species were collected from 5 huts, of which 93.4% was An. arabiensis; O. europaea, E. globulus and J. procera reduced the indoor density of An. arabiensis, with the mean percentage drop of 80%, 73% and 70%, respectively. In the tent trial, smoking of these plants had significant knockdown effects and inhibited feeding on the calves (F = 383.5, DF = 3, P < 0.01). The mean knockdown effect due to O. europaea was relatively high (17.7 ± 0.54; 95% CI 16.8-18.6), while it was only 0.9 ± 0.1 (95% CI 0.29-1.52) in the control tents. All the test plants used in the tent trial caused significantly inhibited feeding activity of An. arabiensis on the host (F = 383.5, DF = 3, P < 0.01). About 94.5%, 89.5% and 86% of mosquitoes were unfed because of the smoking effect of O. europaea, E. globulus and J. procera, respectively, whereas only 19.5% were unfed in the control tent. CONCLUSIONS: Smoking ethno-medicinal plant materials reduced indoor density of malaria vectors and inhibited feeding on calves inside the tents. Thus, plant-based mosquito control methods may play a vital role in reducing mosquito bites in the early hours of the night and thereby reduce residual malaria transmission.
BACKGROUND: Plant-based mosquito control methods may use as a supplementary malaria vector control strategy. This study aimed to evaluate the effect of smoking ethno-medicinal plants on indoor density and feeding activity of malaria vectors at early hours of the night and its residual effect after midnight in southern Ethiopia. METHODS: Both field and tent trials were conducted to evaluate the impact of smoking Juniperus procera leaves, Eucalyptus globulus seeds and Olea europaea leaves in Kolla Shara Village from July 2016 to February 2017. For the field trial, five grass-thatched traditional huts (three for ethno-medicinal plants and two as control [only charcoal smoking and non-charcoal smoking]) were used. Indoor host-seeking mosquitoes were collected by CDC light traps. A Latin square design was employed to minimize the bias due to the variation in house location and different sampling nights. For the tent experiment, 25 3-5-day-old starved wild female Anopheles mosquitoes reared from the larvae were released into the tents where a calf was tethered at the mid-point of each tent. RESULTS: A total of 614 Anopheles mosquitoes belonging to 5 species were collected from 5 huts, of which 93.4% was An. arabiensis; O. europaea, E. globulus and J. procera reduced the indoor density of An. arabiensis, with the mean percentage drop of 80%, 73% and 70%, respectively. In the tent trial, smoking of these plants had significant knockdown effects and inhibited feeding on the calves (F = 383.5, DF = 3, P < 0.01). The mean knockdown effect due to O. europaea was relatively high (17.7 ± 0.54; 95% CI 16.8-18.6), while it was only 0.9 ± 0.1 (95% CI 0.29-1.52) in the control tents. All the test plants used in the tent trial caused significantly inhibited feeding activity of An. arabiensis on the host (F = 383.5, DF = 3, P < 0.01). About 94.5%, 89.5% and 86% of mosquitoes were unfed because of the smoking effect of O. europaea, E. globulus and J. procera, respectively, whereas only 19.5% were unfed in the control tent. CONCLUSIONS: Smoking ethno-medicinal plant materials reduced indoor density of malaria vectors and inhibited feeding on calves inside the tents. Thus, plant-based mosquito control methods may play a vital role in reducing mosquito bites in the early hours of the night and thereby reduce residual malaria transmission.
Authors: Christopher J L Murray; Katrina F Ortblad; Caterina Guinovart; Stephen S Lim; Timothy M Wolock; D Allen Roberts; Emily A Dansereau; Nicholas Graetz; Ryan M Barber; Jonathan C Brown; Haidong Wang; Herbert C Duber; Mohsen Naghavi; Daniel Dicker; Lalit Dandona; Joshua A Salomon; Kyle R Heuton; Kyle Foreman; David E Phillips; Thomas D Fleming; Abraham D Flaxman; Bryan K Phillips; Elizabeth K Johnson; Megan S Coggeshall; Foad Abd-Allah; Semaw Ferede Abera; Jerry P Abraham; Ibrahim Abubakar; Laith J Abu-Raddad; Niveen Me Abu-Rmeileh; Tom Achoki; Austine Olufemi Adeyemo; Arsène Kouablan Adou; José C Adsuar; Emilie Elisabet Agardh; Dickens Akena; Mazin J Al Kahbouri; Deena Alasfoor; Mohammed I Albittar; Gabriel Alcalá-Cerra; Miguel Angel Alegretti; Zewdie Aderaw Alemu; Rafael Alfonso-Cristancho; Samia Alhabib; Raghib Ali; Francois Alla; Peter J Allen; Ubai Alsharif; Elena Alvarez; Nelson Alvis-Guzman; Adansi A Amankwaa; Azmeraw T Amare; Hassan Amini; Walid Ammar; Benjamin O Anderson; Carl Abelardo T Antonio; Palwasha Anwari; Johan Arnlöv; Valentina S Arsic Arsenijevic; Ali Artaman; Rana J Asghar; Reza Assadi; Lydia S Atkins; Alaa Badawi; Kalpana Balakrishnan; Amitava Banerjee; Sanjay Basu; Justin Beardsley; Tolesa Bekele; Michelle L Bell; Eduardo Bernabe; Tariku Jibat Beyene; Neeraj Bhala; Ashish Bhalla; Zulfiqar A Bhutta; Aref Bin Abdulhak; Agnes Binagwaho; Jed D Blore; Berrak Bora Basara; Dipan Bose; Michael Brainin; Nicholas Breitborde; Carlos A Castañeda-Orjuela; Ferrán Catalá-López; Vineet K Chadha; Jung-Chen Chang; Peggy Pei-Chia Chiang; Ting-Wu Chuang; Mercedes Colomar; Leslie Trumbull Cooper; Cyrus Cooper; Karen J Courville; Benjamin C Cowie; Michael H Criqui; Rakhi Dandona; Anand Dayama; Diego De Leo; Louisa Degenhardt; Borja Del Pozo-Cruz; Kebede Deribe; Don C Des Jarlais; Muluken Dessalegn; Samath D Dharmaratne; Uğur Dilmen; Eric L Ding; Tim R Driscoll; Adnan M Durrani; Richard G Ellenbogen; Sergey Petrovich Ermakov; Alireza Esteghamati; Emerito Jose A Faraon; Farshad Farzadfar; Seyed-Mohammad Fereshtehnejad; Daniel Obadare Fijabi; Mohammad H Forouzanfar; Urbano Fra Paleo; Lynne Gaffikin; Amiran Gamkrelidze; Fortuné Gbètoho Gankpé; Johanna M Geleijnse; Bradford D Gessner; Katherine B Gibney; Ibrahim Abdelmageem Mohamed Ginawi; Elizabeth L Glaser; Philimon Gona; Atsushi Goto; Hebe N Gouda; Harish Chander Gugnani; Rajeev Gupta; Rahul Gupta; Nima Hafezi-Nejad; Randah Ribhi Hamadeh; Mouhanad Hammami; Graeme J Hankey; Hilda L Harb; Josep Maria Haro; Rasmus Havmoeller; Simon I Hay; Mohammad T Hedayati; Ileana B Heredia Pi; Hans W Hoek; John C Hornberger; H Dean Hosgood; Peter J Hotez; Damian G Hoy; John J Huang; Kim M Iburg; Bulat T Idrisov; Kaire Innos; Kathryn H Jacobsen; Panniyammakal Jeemon; Paul N Jensen; Vivekanand Jha; Guohong Jiang; Jost B Jonas; Knud Juel; Haidong Kan; Ida Kankindi; Nadim E Karam; André Karch; Corine Kakizi Karema; Anil Kaul; Norito Kawakami; Dhruv S Kazi; Andrew H Kemp; Andre Pascal Kengne; Andre Keren; Maia Kereselidze; Yousef Saleh Khader; Shams Eldin Ali Hassan Khalifa; Ejaz Ahmed Khan; Young-Ho Khang; Irma Khonelidze; Yohannes Kinfu; Jonas M Kinge; Luke Knibbs; Yoshihiro Kokubo; S Kosen; Barthelemy Kuate Defo; Veena S Kulkarni; Chanda Kulkarni; Kaushalendra Kumar; Ravi B Kumar; G Anil Kumar; Gene F Kwan; Taavi Lai; Arjun Lakshmana Balaji; Hilton Lam; Qing Lan; Van C Lansingh; Heidi J Larson; Anders Larsson; Jong-Tae Lee; James Leigh; Mall Leinsalu; Ricky Leung; Yichong Li; Yongmei Li; Graça Maria Ferreira De Lima; Hsien-Ho Lin; Steven E Lipshultz; Shiwei Liu; Yang Liu; Belinda K Lloyd; Paulo A Lotufo; Vasco Manuel Pedro Machado; Jennifer H Maclachlan; Carlos Magis-Rodriguez; Marek Majdan; Christopher Chabila Mapoma; Wagner Marcenes; Melvin Barrientos Marzan; Joseph R Masci; Mohammad Taufiq Mashal; Amanda J Mason-Jones; Bongani M Mayosi; Tasara T Mazorodze; Abigail Cecilia Mckay; Peter A Meaney; Man Mohan Mehndiratta; Fabiola Mejia-Rodriguez; Yohannes Adama Melaku; Ziad A Memish; Walter Mendoza; Ted R Miller; Edward J Mills; Karzan Abdulmuhsin Mohammad; Ali H Mokdad; Glen Liddell Mola; Lorenzo Monasta; Marcella Montico; Ami R Moore; Rintaro Mori; Wilkister Nyaora Moturi; Mitsuru Mukaigawara; Kinnari S Murthy; Aliya Naheed; Kovin S Naidoo; Luigi Naldi; Vinay Nangia; K M Venkat Narayan; Denis Nash; Chakib Nejjari; Robert G Nelson; Sudan Prasad Neupane; Charles R Newton; Marie Ng; Muhammad Imran Nisar; Sandra Nolte; Ole F Norheim; Vincent Nowaseb; Luke Nyakarahuka; In-Hwan Oh; Takayoshi Ohkubo; Bolajoko O Olusanya; Saad B Omer; John Nelson Opio; Orish Ebere Orisakwe; Jeyaraj D Pandian; Christina Papachristou; Angel J Paternina Caicedo; Scott B Patten; Vinod K Paul; Boris Igor Pavlin; Neil Pearce; David M Pereira; Aslam Pervaiz; Konrad Pesudovs; Max Petzold; Farshad Pourmalek; Dima Qato; Amado D Quezada; D Alex Quistberg; Anwar Rafay; Kazem Rahimi; Vafa Rahimi-Movaghar; Sajjad Ur Rahman; Murugesan Raju; Saleem M Rana; Homie Razavi; Robert Quentin Reilly; Giuseppe Remuzzi; Jan Hendrik Richardus; 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