过去防治美国白蛾多采用化学药剂,虽然有一定效果,但因杀死了大量天敌,造成了害虫再猖撅的恶性循环。近年来,我们采用美国白蛾核型多角体病毒、苏云金杆菌MS O7 A、灭幼脲3号生物药剂与化学农药交替使用,使树木的被害率由过去的60～70％,下降到2％,取得了较好的防治效果。 In the past, the prevention and treatment of American white moth by using more chemical agents, although with certain effect, killed a large number of natural enemies and caused a vicious cycle of pests re-rampant. In recent years, we use the United States white moth nuclear polyhedrosis virus, Bacillus thuringiensis MS O7 A, biuret No. 3 biological agents and chemical pesticides used interchangeably, so that the tree damage rate from 60 to 70% in the past, down to 2% , Made a better control effect.