八种杀虫剂对棉田龟纹瓢虫、草间小黑蛛的影响

Effect of 8 Insecticides on Propylaea japonica (Thunb) and Erigonidium graminicolum(Sunderall)in Cotton Field

在棉田常用的８种杀虫剂中，对害虫天敌瓢虫安全的杀虫剂是灭多成和哒螨灵；对草间小、黑蛛安全的杀虫剂有吡虫啉、哒螨灵和灭多戚。３种拟除虫菊酯类杀虫剂对两种天敌的毒性最大，有机磷类杀虫剂则低于菊酯类。

Among 8 insecticides often used in cotton fields,methomyl and pyridaben were safe to Propysaea japonica (Thunb);imidacloprid,pyridaben and methomyl were safe to Erigonidium graminicolum(Sunderall).Pyrethroid insesticides were most toxic to both the natural enemies,and organophosphorus were lower than of pyrethroide.