二十多年来,人们对于害虫的化学防治的看法发生过一度的变化。五十年代时。由于害虫对杀虫药剂普遍发生了抗性,使得很多人对于化学防治的有效性产生了怀疑,但是更严重的乃是后来发现的杀虫药剂的公害与污染问题,这也是一个以前没有预见到的问题。杀虫药剂污染及破坏了生态系统,对自然界的生物及人畜引起了潜在的威胁。 For more than two decades there has been some change in the perception of chemical control of pests. Fifties time. The widespread resistance of pests to insecticides has led many to question the effectiveness of chemical control, but more so is the problem of pollution and pollution of pesticides later discovered, a problem that was previously unforeseen The problem. Insecticide contamination and destruction of ecosystems pose a potential threat to living beings and humans and animals in nature.