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害虫抗药性的产生是其对外来物质进行选择性适应的一种现象,也是连续并大量使用某一化学农药品种的必然结果。正如在生产中,人们不难发现施用任何一种新杀虫剂,开始都能表现出良好的杀虫效果,但随着用药次数的增加,即使用量不断加大,其药效不但没有提高,反而逐步降低,甚至无效,这并非是农药的质量下降,正是害虫对这种农药产生了抗药性的现象。如何防止害虫抗药性的产生,首先应从根本上找出害虫对农药产生抗性的原因,才能采取有效的防止对策。害虫抗药性的产生一般有四个途径;一是自然抗性。这是由于农药对害虫的生理不产生影响,无杀伤效果所致;二是获得抗性。一些
The emergence of pest resistance is a phenomenon of its selective adaptation to exotic substances, and is also the inevitable result of continuous and extensive use of a certain chemical pesticide variety. Just as in production, it is not hard to find that the application of any new pesticide can show good insecticidal effect initially. However, as the dosage increases, the efficacy of pesticides has not been improved. But gradually reduce or even invalid, not because of the decline of the quality of pesticides, it is the pest of this pesticide resistance phenomenon. How to prevent the emergence of pest resistance, we must first find out the root causes of pest resistance to pesticides in order to take effective measures to prevent. Pesticide resistance in general there are four ways; First, natural resistance. This is due to pesticides on the physiological effects of pests, no killing effect; the second is to obtain resistance. some