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在防治农作物病虫害时,混合使用农药,一是能防治同时发生的几种病虫害;二是能改进药剂的性能,提高防治效果;三是药剂之间可以互相取长补短;四是能防止并克服害虫的抗药性;五是能节省劳力、减少用药量,降低防治成本。但是,由于农药的理化性质所限制,不少农药混用后会起化学反应,降低药效,甚至失效;有时还会对农作物产生药害,既造成了浪费,又延误了防治病虫害的最佳时
In the prevention and control of crop pests and diseases, the mixed use of pesticides, one can control several pests and diseases simultaneously; the second is to improve the performance of pharmaceuticals to improve the control effect; three drugs can complement each other; Fourth, to prevent and overcome pests Fifth, it can save labor, reduce the dosage and reduce the cost of prevention and treatment. However, due to the limitation of the physical and chemical properties of pesticides, many pesticides will react chemically after being mixed to reduce the efficacy and even invalidate pesticides. Sometimes, phytotoxicity will occur on crops, causing waste and delaying the best of pest control