七星瓢虫对甜菜蚜及其寄主植物蚕豆利它素的反应

Kairomone Responses of the Predator, Coccinella septempunctata to the Aphld.Aphis fabae the Aphid Host Plant, Vicia fabe

本文设计了气流式８臂昆虫嗅觉仪，测定七星瓢虫成虫及不同龄幼虫对甜菜蚜及其寄主植物蚕豆利它素的反应。研究结果表明七星瓢虫成虫对寄主植物蚕豆利它素的选择性（平均达１４．８％），是对甜菜蚜利它素选择性（８．７％）的１．７倍；七星瓢虫幼虫对蚕豆利它素选择性（平均达２．９％）．仅为对甜菜蚜利它素选择性（１８．６％）的１／６．在对猎物及寄主植物利它素选择过程中，幼虫活动性差，对利它素无反应的幼虫的百分比（１８．５）是成虫（１．７）的１１倍。可以推断，在自然界中，七星瓢虫成虫主要担任着猎物生境的寻找，成虫活动决定了种群的活动范围，幼虫和成虫以猎物利它索为导向寻食甜菜蚜虫。

A new airflow 8-armed olfactometer has been developed to test the kairomone responses of the predator. Coccinella scptempunctata. the. aphid. Aphis fabea, and its host plant. Vicia fabe. The results showed that the percentage of kairomone response of the adult predator to the host plant counted to 14. 85%, as 1.7 times high as that to the aphid.that of larvae to the host plant was only 2.9%, as 1/6 times high as that to the aphid. The activity of the lalvae predator re-sponding to the kairomone was much Iower than that of the adult.It is assumed that a decision in selection of host habitat location in the hature may be made by the adult predator and the larvae may be passive in searching the food choosen by their adults.