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长期以来,菜农依赖大量施用化学合成农药防治蔬菜病虫害,出现了农药用量愈用愈大,病虫愈治愈猖獗的恶性循环局面,病虫抗药性增强,化学防治效果下降。不仅污染蔬菜产品,使蔬菜产品中
For a long time, vegetable farmers rely heavily on the use of chemical synthetic pesticides to control pests and diseases of vegetables. There is a vicious cycle of increasing the amount of pesticides used and the more and more rampant pests and diseases. Insecticide resistance and pest resistance are reduced. Not only contaminate vegetable products, make vegetable products