不同生境异色瓢虫对茶梢互利素和蚜虫利它素EAG和行为反应

Electroantennogram and behavioural responses of two varieties of Leis axyridis from three types of habitats to aphid-damaged tea shoot volatiles and aphid kairomones

触角电位 ( EAG)研究和选择性行为反应表明茶梢受茶蚜 ( Toxoptera aurantii Boyer)为害后能释放引诱异色瓢虫[Leisaxyridis( Pallas) ]的互利素 ,茶蚜、萝卜蚜 Lipaphiserysimi ( Kaltenbach)体表和茶蚜蜜露中含有吸引异色瓢虫的利它素 ,其中的少数特异性组分引诱活性较强。源于茶园、桑园和菜园的互利素或利它素对各自生境中的异色瓢虫更具刺激性 ,显示了生境特定性。 EAG剂量反应表明茶园中的显明变种比显现变种稍敏感 。

Electroantennogram (EAG) and behavioural responses show that the tea shoots damaged by tea aphid,Toxoptera aurantii,emit synomones capable of seducing tea aphid's natural enemies,Leis axyridis (Pallas) var.spectabilis Faldermaenn and Leis axyridis (Pallas) ab.conspicua Faldermaenn.Hexane or ether rinses of body surface of T.aurantii and mustard aphid,Lipaphis erysimi and honeydew of T.aurantii contain kairomones luring the two varieties of the ladybug,in which a few specific components are proved to be more attractive than the other ones.The synomones and the kairomones derived from tea,mulberry and vegetable gardens are especially stimulative to ladybugs from the respective habitats,demonstrating the habitat specificity of EAG and behavioural responses of the ladybugs.EAG dose-responses suggest that L.axyridis (Pallas) var.spectabilis Faldermaenn is a little more sensitive to semiochemicals than L.axyridis (Pallas) ab.conspicua Faldermaenn,probably for there are chemical sensors on the antennae of the former than the later.