为了保护农作物和粮食免受害虫和病菌的危害,促进农业生产的发展,保证粮食丰收,囤内外广泛采用化学农药防治病虫害,取得了显著的效果。随之化学农药的使用,人们逐渐发现第一代杀虫剂有机氯农药,一方面对人类有累积性毒性,另一方面由于抗性作用,杀虫效果也随之降低。因而产生了第二代杀虫剂有机磷农药,此种农药品种繁 In order to protect crops and food from harmful pests and pathogens, promote the development of agricultural production and ensure the harvest of grain, extensive use of chemical pesticides inside and outside the store to prevent pests and diseases has achieved remarkable results. Followed by the use of chemical pesticides, people gradually found that the first generation of pesticides, organochlorine pesticides, on the one hand cumulative toxic to humans, on the other hand due to resistance, insecticidal effect also will be reduced. As a result, the second generation of pesticides, organophosphorus pesticides, has been produced