[Effects of volatiles from chestnut on host preference of adult Conogethes punctiferalis (Lepidoptera: Pyralidae)].

Through field survey and the tests of behavioral response, EAG response, and multiple-choice oviposition, this paper studied the effects of volatiles from Nongda No. 1 chestnut (NC) and Heyuan oil chestnut (HC) on the host-selection behavior of adult Conogethes punctiferalis. The field survey in 2004-2008 showed that the moth-eaten rate of NC fruits by adult C. punctiferalis was 16.1%-25.3%, while that of HC fruits was less than 5%. The volatiles from NC fruits and leaves were more attractive to female than to male moths, and the fruit volatiles were more attractive than leaf volatiles. However, the volatiles from HC fruits and leaves were not attractive to both female and male moths. The EAG response showed that female moths had significantly higher response to NC fruit volatiles than to HC's, but male moths had no significant difference in this response. For both NC and HC, the EAG responses of female and male moths to fruit volatiles were higher than those to leaf volatiles. The number of eggs laid by female moths was much greater on NC fruits than on NC leaves and on HC fruits and leaves, but had no significant differences on the latter three.