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选用８种选择性杀虫剂田间防治菜青虫和菜蚜，并在室内条件下测定了对四种天敌昆虫七星瓢虫、龟纹瓢虫、菜蚜茧蜂和菜粉蝶蛹金小蜂成虫及七星瓢虫蛹的毒杀作用。结果表明，植物质杀虫剂克蚜素和蚜螨敌对莱青虫、莱蚜均有良好的防效，而对四种天敌昆虫均有较好的选择性；除虫脲、定虫隆、灭幼脲和氟虫脲及Ｂ．ｔ．对菜青虫杀虫效果较为迟缓，但第七天防效可达１ＯＯ％，对天敌昆虫选择性均较强。不同天敌昆虫种类及不同虫态耐药力不同，以七星瓢虫蛹耐药力最强；七星瓢虫成虫耐药力大于龟纹瓢虫成虫；莱粉蝶蛹金小蜂成虫大于菜蚜茧蜂成虫。
Eight kinds of selective insecticides were used in the field to control Pieris rapae and Aphis gossypii. Four adult insects, Coccinella septempunctata, Coccinella septempunctata, Seven Star Ladybug pupa poisonous effect. The results showed that the phytochemical insecticides aphid and aphids were resistant to both the larvae and the larvae, but had good selectivity for all the four natural enemies. The insecticides diflubenzuron, Urea and flufenoxuron and B. t. Insecticidal effect on Pieris rapae relatively slow, but the seventh day control effect up to 1OO%, the selectivity of natural enemies are strong. Different natural enemies of insect species and different resistance in different states of insect resistance to the seven ladybugs most resistant to pupae; adult ladybird ladybug resistance is greater than the adult ladybug; Ladybird pupal golden adult beetle than cabbage aphid Adult.