杀虫药剂对茄二十八星瓢虫及瓢虫柄腹姬小蜂的选择毒性

在室内测定了8种杀虫剂对茄二十八星瓢虫幼虫及其主要天敌瓢虫柄腹姬小蜂的毒力。结果 表明，阿维菌素对茄二十八星瓢虫和瓢虫柄腹姬小蜂具有较高的选择性，氰戊菊酯次之，而氟虫腈等则无选择性，建议在天敌较丰富的季节，优先选用阿维菌素防治茄二十八星瓢虫，氰戊菊酯可与阿维菌素交替使用。

Selective Toxicity of Eight Insecticides to Henosepilachna vigintioctopunctata Fabricius and Pediobius foveolatus Crawford

Toxicity of 8 insecticides to the larvae of Henosepilachna vigintioctopunctata Fabricius and its major larval parasite, Pediobius foveolatus Crawford ,was investigated in the laboratory.Abamectin showed highest selective toxic ity between H.vigintioctopunctata and P.foveolatus and fenvalerate a lit tle bit lower.Fipronil etc.had no selective protection to P.foveolatus. It is recommended that abamectin should be selected to control H.vigintioctopunctat a during seasons when P.foveolatus and other natural enemies are relativel y numerous and fenvalerate may be alternatively used.