论文部分内容阅读
由于长期应用化学药剂防治田间作物病虫害的经验,烟农在发现他的烟草受病虫害威胁时也立即采用这种方法。过去有些欧洲国家在烟草上不施用农药,但自1960年开始传染霜霉病之后,在不同的年代中,田间烟草要施用4种到15种的杀真菌制剂。有些农药在制成时仅只是考虑了它的效果而不顾它的付作用。例如滴滴涕在推广后,一些捕食害虫的乌由于它们的钙素代谢被滴滴涕残留物打乱而绝迹了。另外,对烟草中农药的残量作了严格的立法规定。所以迫切需要降低农作物中农药的残留量。
Due to the long-term experience of using chemical agents to control pests in field crops, tobacco farmers immediately adopted this method when they discovered that their tobacco was threatened by pests and diseases. In the past, some European countries did not apply pesticides to tobacco. However, after they started to transmit downy mildew in 1960, four to 15 kinds of fungicide were applied to field tobacco in different ages. Some pesticides when made are only considered its effect regardless of its role. For example, after DDT was put on promotion, some predatory pests were extinct due to the disruption of their calcium metabolism by DDT residues. In addition, the residual pesticides in tobacco made strict legislative provisions. Therefore, there is an urgent need to reduce the amount of pesticide residues in crops.