人们应用天然及无机药物防治农业害虫的历史已有2 0 0 0余年,从上世纪4 0年代起又出现了以DDT为代表的有机合成农药,它们虽然在增加农作物产量、提高劳动效率等方面起到很大作用,但由于它是一类自然界不存在,又是人主动投放到环境中的毒物,以致其负面效果逐渐突显,并给人类健康 People have been using natural and inorganic medicine to prevent and control agricultural pests for more than 200 years. Since the 40s of the last century, organic synthetic pesticides represented by DDT have emerged. Although they have been used to increase crop yields and improve labor efficiency But because it is a type of poison that nature does not exist and is put into the environment on its own initiative, its negative effect is gradually highlighted and gives human health