菜青虫是白菜、甘兰等蔬菜的主要害虫,近年来大量发生。常用的敌百虫农药防效低,成本高;部分社队重新使用666防治,由于出现药害,污染蔬菜,对人畜威胁极大。因此,筛选高效低毒的防治菜青虫农药,已成为蔬菜生产上急待解决的大问题。中西除虫菊酯、杀灭菊酯是人工合成的新农药。其优点:击倒力强,杀虫效果高,毒性低,使用安全,易降解,无残毒,无污染。1981年我们在室内外多次用中西除虫菊酯、杀灭菊酯对菜青虫进行了防治试验,示范,均取 Pieris rapae cabbage, cabbage and other vegetables, the main pests, occurred in large quantities in recent years. Commonly used trichlorfon pesticides with low effectiveness and high cost; some of the communes and regrouped 666 control, due to injury, pollution of vegetables, great threat to humans and animals. Therefore, the screening of high efficiency and low toxicity of cabbage pesticides has become an urgent problem in vegetable production. Chinese and western pyrethrins, fenvalerate synthetic new pesticides. Its advantages: strong knock-down, high insecticidal effect, low toxicity, safe use, easy to degrade, no residue and no pollution. In 1981, we used Chinese and western pyrethrins many times both indoors and outdoors,