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近年来,随着用药范围、用药数量的增多,害虫抗性越来越突出,特别在一些大田连片连作地区,像一些棉区、稻田,很多害虫已对有些药物产生了很大的抗性,出现了某些药物防治效果下降甚至不管用的现象。这与农民用药习惯不良、缺乏科学用药知识,以及基层个别经销商不科学甚至有意误导或错误指导有着很大关系。主要表现在:一是很多农民一旦认为某种农药效果较好,就会连年购买,一年四季使用。像吡虫啉、氧化乐果、
In recent years, pest resistance has become more and more prominent with the increase of the dosage and dosage, especially in some contiguous areas such as some cotton fields and paddy fields. Many pests have been greatly resistant to some drugs , There has been some decline in the efficacy of some drugs or do not work with the phenomenon. This is far from farmers with poor habits of medication, lack of knowledge of scientific medication, as well as grass-roots individual dealers unscientific or even deliberately misleading or wrong guidance has a great relationship. Mainly manifested in: First, many farmers, once considered a better pesticide, will be purchased year after year, year after year use. Like imidacloprid, omethoate,