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防治害虫,必须以它的发生规律为依据,抓住薄弱环节,采取防治措施,才能收效。因此,了解害虫的发生规律,至关重要。本文试就这个问题作一些探讨,不当之处,尚祈指正。 一、怎样正确理解害虫的发生规律 一般认为,了解害虫的生活史就是了解发生规律;所谓薄弱环节,也是由生活史中去寻找。生活史大体包含一年发生几代,幼虫蜕皮几次,各个虫态历时几天,生活习性如何,怎样越冬等等,一般没有对害虫种群数量变化的原因作深入的研究,没有接触到害虫发生规律的本质问题。
Pest control must be based on the law of its occurrence, to seize the weak links, take prevention and control measures to be effective. Therefore, understanding the law of pests is crucial. This article tries to make some discussions on this issue. First, how to correctly understand the law of occurrence of pests It is generally believed that to understand the life cycle of pests is to understand the law; the so-called weak links, but also from the life history to find. Life history generally includes several generations a year, larva molt several times, the various larvae lasts a few days, how to live, how winter, etc., generally do not make any in-depth study of the reasons for the change in the number of pests, did not come into contact with pests The nature of the law.