一些农药特别是新药,开始防虫效果很好但慢慢效果越来越差,甚至无效果。于是,不少农民就埋怨是假农药。其实却不然,主要是因害虫对农药产生了适应性,即抗药性。那么害虫抗药性是怎样形成的呢?应采取什么对策才能减轻或避免呢? 一、害虫抗药性的形成 1.自然抗性这是因为某种农药对害虫的生理不产生影响,无杀伤效果所致的一种抗性。 2.获得抗性这是害虫对某种农药长期使用反复刺激和自身“筛 Some pesticides, especially new drugs, have good pest control effects, but their effects are getting worse or even worse. As a result, many farmers complain about fake pesticides. In fact, it is not the case, mainly due to pests on the pesticide has become adaptable, that is, resistance. So what is the formation of pest resistance? What measures should be taken to reduce or avoid it? First, the formation of pest resistance 1. Natural resistance This is because some pesticides on the pest physiology does not have an impact, no killing effect A resistance caused by. 2. Obtained resistance This is the long-term use of pesticides on pests and repeated stimulation of their own ”sieve