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松毛虫的发生、发展、和死亡,严格地受着气候、天敌、食料、人为等因子的限制,因此常常出现着某些年份、某些地区猖獗成灵,某些年份、某些地区即使不受人为的干涉也会自然的下降。这种猖獗与下降的因果,总称为松毛虫的消长规律。掌握了这个规律,对研究如何在人为的控制和支配下,防止松毛虫的为害有着重大的作用。引起松毛虫的消长变化,有气候、天敌、食料、人为等因子,但谁占主导作用?这应当视时间、条件、地点的不同,分别估价着各种因子的作用。譬
The occurrence, development and death of the pine caterpillars are strictly limited by factors such as climate, natural enemies, food stuffs and man-made factors. Therefore, some years often occur, some areas become rampant, and in some years, some areas do not Artificial interference will naturally decline. This rampant and declining causal, collectively referred to as the growth and decline of the pine caterpillars. Grasping this law has a major impact on how to prevent the damage caused by pine caterpillars under the control and control of man. The fluctuation of the growth and development of pine caterpillars is caused by factors such as climate, natural enemies, food stuffs and man-made ones, but who dominates? This should evaluate the role of various factors depending on the time, conditions and locations. analogy