寄主及寄主植物信息化合物对台湾甲腹茧蜂选择行为的影响OA

To elucidate the behavioral mechanisms underlying host selection in Chelonus formosanus Sonan,this study investigated the relative suitability of host eggs and host plant leaves for parasitoid localization and utilization,focusing on egg surface traits and plant volatile cues.Using Y-tube olfactometer assays and cage choice experiments,the responses of C.formosanus were evaluated toward wax-covered and non-wax cov-ered eggs of Spodoptera frugiperda Fabricius and Spodoptera litura Fabricius,as well as leaves of Chinese cabbage,tobacco,and maize under fresh,mechanically damaged,and herbivore-damaged conditions.Wax-covered eggs of S.litura significantly attracted the parasitoid,with an at-traction rate of 73.33%,which was significantly higher than that of the blank control(P=0.000 6)and other treatments.Herbivore-damaged leaves of cabbage and maize elicited the highest attraction rates(78.38%,P=0.000 6;84.38%,P=0.000 6),while both healthy and mechani-cally damaged tobacco leaves induced avoidance,though herbivore-damaged tobacco leaves remained highly attractive(88.57%,P＜0.000 1).These results indicate that C.formosanus can simultaneously detect physical traits of host eggs and volatile cues from host plants to efficiently lo-cate hosts.The findings provide theoretical support for the targeted application of C.formosanus in the biological control of agricultural pests.