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我盟有松树面积60多万亩,近五年来,遭松毛虫危害的有16万多亩,其中危害严重的占26％。主要危害松树针叶,轻的可使针叶枯萎。严重的可将针叶全部吃光,使树木呈现一片枯黄,如继续严重危害2—3年,树木就会死亡。松毛虫发生量大而且严重,属灾害性害虫,主要集中在我盟南部山区,特别是与辽宁接壤的地区更为严重,对松树成林、成材威胁很大。油松毛虫属于鳞翅目,枯叶蛾科。在我盟一年一代,主要以3龄幼虫越冬,个别也有2龄或4龄越冬的。
I have alliance pine area of more than 600000 acres, the past five years, was detrimental to pine caterpillar 160,000 acres, of which 26% of the serious harm. The main hazard pine needles, light can make needles withered. Serious can be eaten all the needles, so that the trees showed a yellow, if continue to seriously harm 2-3 years, the trees will die. Dendrolimus occurred in large quantities and serious, is a catastrophic pest, mainly in the southern mountainous areas of our Union, especially in areas bordering Liaoning more serious, the pine forest, timber threatening. Dendrolimus caterpillars belong to Lepidoptera, Lepidoptera. In the first year of our union, the third-instar larvae winters mainly, and there are also second- or fourth-instar winters.