防治害虫,必须以它的发生规律为依据。但是,什么是害虫的发生规律?我们对于害虫的发生规律掌握了多少?人们有不同的见解。因此,首要的问题是必须对害虫的发生规律有正确的认识,否则害虫防治工作将会迷失方向。有一种很普遍的见解,认为了解害虫的生活史就是了解害虫的发生规律,我们对于主要害虫的发生规律已经了解很清楚,只要针对生活史中所谓薄弱环节,进行防治,就能生效。生活史包含什么内容呢?大体地说,它包含一年发生几代,幼虫脱皮几次,各个虫态历时几天,生活习性如何,怎样越冬,等等,一般没有对害虫虫口数量变动的原因作深入的研 Pest control must be based on the law of its occurrence. However, what is the law of occurrence of pests? How much of the law about the occurrence of pests? People have different opinions. Therefore, the most important issue is that we must correctly understand the law of pest occurrence, otherwise the pest control work will lose its direction. There is a very common belief that understanding the pest’s life cycle is about understanding the law of occurrence of pests. We know the law of occurrence of major pests very well and take effect as long as we control the so-called weaknesses in life history. What does life history contain? Generally speaking, it contains several generations a year, how many times the larvae have peeled, how many larvae have lasted for a few days, how they live, how to winters, etc. There is generally no reason why the population of pests varies Make in-depth research