1.对症下药,防止污染每一种农药都有适宜的防治对象和范围,没有“万能药”,如胃毒作用较强的杀虫剂一般只对咬食蔬菜叶、茎、根的咀嚼式口器的菜青虫、烟青虫等有效,而对刺吸式口器的害虫作用不大。因此在选择农药时,要根据所发生的病、虫、草害选择对症的农药。在蔬菜上尽量选用生物农药,如 BT 乳剂,青虫菌、农用链霉素、BO—10等;高效低 1. Right remedy to prevent pollution Each pesticide has the appropriate control targets and scope, there is no “panacea”, such as strong stomach poisoning insecticides are generally only on the bite of vegetables, leaves, stems, roots chewing mouth Pieris rapae, tobacco caterpillars and other effective, while the piercing suction mouthparts little role in pests. Therefore, the choice of pesticides, according to the occurrence of diseases, insects, grass and choose the symptomatic of pesticides. Try to use biological pesticides in vegetables, such as BT emulsion, caterpillar fungus, agricultural streptomycin, BO-10, etc .; high efficiency low