几种药剂对春甘蓝田小菜蛾及其天敌的影响

[目的]研究几种药剂对春甘蓝田小菜蛾及其天敌的影响.[方法]研究了毒死蜱、氯虫苯甲酰胺、阿维菌素及其混剂处理对春甘蓝田小菜蛾及捕食性天敌的影响.[结果]毒死蜱对小菜蛾的控制作用不理想,药后1、3、7d的防治效果分别为18.17％、45.77％和-13.18％,对捕食性天敌有明显的负面影响.阿维菌素对小菜蛾有一定的防治作用,最高防效（药后3 d）为60.42％,对捕食性天敌较安全.氯虫苯甲酰胺及阿·氯混剂和氯·毒混剂对小菜蛾均有很好的防治效果,药后7、14 d的防治效果分别达到89.92％、79.17％、75.51％和81.10％、69.53％、88.85％,同时对捕食性天敌较安全.[结论]该研究有助于保护和加强天敌对害虫的自然控制作用.

Effects of Several Insecticides on Plutella xylostella and Predatory Enemyies in Spring Cabbage Fields

[Objective] The aim was to study effects of several insecticides on Plutella xylostella and predatory enemyies in spring cabbage fields.[Method] The effects of chlorpyrifos,clorantraniliprole,abamectin and their mixtures on Plutella xylostella and predatory enemies in spring cabbage fields were studied.[Result] The results showed that the control effects of chlorpyrifos on Plutella xylostella were not satisfied with the control effects （1 d、3 d、7 d after treatment） of 18.17％ 、45.77％ and-13.18％ respectively and had evident negative impact on predatory enemies.Abamectin had certain control effect on Plutella xylostella with the highest control rate of 60.42％ （3 d after treatment）and low negative impact on predatory enemies.Clorantraniliprole,mixture of abamectin and clorantraniliprole and mixture of clorantraniliprole and chlorpyrifos had satisfactory control effects on Plutella xylostella with the control rates of 89.92％,79.17 ％,75.51％ （7 d after treatment）and 81.10％,69.53％,88.85％ （14 d after treatment） respectively.In the meantime,they had minor negative impact on predatory enemies.[Conclusion] The study was halpful to protect and increase the natural control effects of natural enemies on insect pests.