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害虫的抗药性在一个地区,长期使用某种农药防治某种害虫,药效会逐渐降低,要加大几倍,几十倍,几百倍,甚至更多的药量,才能达到原来的防治效果,这就表明害虫出现了抗药性。现在国内已知产生抗药性的害虫已有30多种;国外已有200多种。害虫的抗药性,一般分为自然抗药性和获得性抗药性。自然抗药性,是指害虫在不同的发育阶段,对某种农药表现出较强的先天性耐药能力;获得性抗药性,是指在同一地区长期使用某种农药后,引起
Pest resistance in a region, long-term use of certain pesticides to control certain pests, the efficacy will be gradually reduced, to increase several times, several times, several hundred times, even more doses, in order to achieve the original control Effect, which indicates that the pest appeared resistance. Now known to produce drug-resistant pests have more than 30 species; there are more than 200 foreign species. Pest resistance, generally divided into natural resistance and acquired resistance. Natural resistance refers to pests in different stages of development, a certain pesticide showed a strong ability of congenital resistance; acquired resistance refers to the same area in the long-term use of a pesticide, causing