抗性小菜蛾等的防治防治抗性小菜蛾　我国南方蔬菜产区，小菜蛾对有机磷、氨基甲酸酯、拟除虫菊酯等杀虫剂产生了不同程度的抗药性。华南农大等单位引进美国的生物杀虫杀螨剂“害极灭”防治小菜蛾，已取得成功。在南方害极灭每年只应用２次，即５～６月和９～１０月危害高... Resistance to Plutella xylostella and other prevention and control of resistance Plutella xylostella Southern China vegetable production areas, diamondback moth on organic phosphorus, carbamate, pyrethroid pesticides such as varying degrees of resistance. South China Agricultural University and other units to introduce the United States biological insecticide miticide “extremely off” control diamondback moth, has been successful. Extremely harmful in the south only 2 times per year, that is, from May to June and from September to October, the harm is high ...