黑缘红瓢虫对几种林果害虫与寄主复合体的行为反应

利用Y形嗅觉仪观测了黑缘红瓢虫对几种常见林果健康无虫植株、桃粉大尾蚜和朝鲜球坚蚧虫体自身与分泌物,及植物与蚜虫复合体的定向和选择行为。结果表明：健康无虫的桃树、樱桃李、毛白杨和油松,不产生招引黑缘红瓢虫的挥发性次生物质;桃粉大尾蚜和朝鲜球坚蚧虫体自身与分泌物对黑缘红瓢虫搜索行为亦无显著影响;当寄主植物受到两种害虫为害后,桃树和樱桃李能释放招引黑缘红瓢虫的挥发性物质,而毛白杨和松树在受到蚜虫为害后所释放的挥发物对黑缘红瓢虫无招引作用。结果表明,受害植物的挥发性物质在黑缘红瓢虫搜索猎物中具有重要作用。经长时间不同食物源喂养黑缘红瓢虫,并不影响其搜索行为。

Orientation Response of Chilocorus rubidus Hope to Prey and Host Plant Volatiles

Orientation response of field-collected individuals of the ladybird adults, Chilocorus rubidus Hope, to volatiles from aphid, Hyalopterus amygdale, Chaitophorus populialbae, Cinara pinitabulaeformis, sacle, Didesmococcus koreanus, from aphid or scale-infested plants, and from uninfested plants were tested with Y-tube olfactometer bioassays. Both male and female adults of C. rubidus showed a significant preference for volatiles from H. amygdale or D. koreanus-infested host plants. However, both of them did not response positively to volatiles from H. amygdale, D. koreanus, from uninfested plants, Prunus persica , Prunus ceraifera , Populus tomentosa , Pinus tabulaeformis and from C. populialbae or C. pinitabulaeformis-infested host plants. The results indicate that C. rubidus may use volatiles from prey-infested plants as the olfactory cue for prey location.