打了农药,害虫却不死,这可怎么办?农药之所以不能发挥效果,除了农药自身因素外,不科学的使用方法也会直接影响药效,通常有以下几种情况:没有害虫先打药一般来说,没有发现害虫不要打药。这是因为目前使用的杀虫农药多数是触杀剂或胃毒剂,也就是说要接触到害虫身体或被害虫吞食进入体内才会发生作用。而我们提倡在害虫发生初期用 Pesticides, pests but not dead, how can this be done? The reason why pesticides can not play an effect, in addition to pesticide itself factors, the unscientific method of use will also have a direct impact on efficacy, usually the following situations: no pests first fight general For no pests do not fight drugs. This is because the majority of pesticide pesticides currently used are contact or stomach agents, which means they have to be exposed to the body of pests or swallowed by pests to enter the body. And we advocate the early use of pests