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文章针对内蒙古自治区大兴安岭地区的落叶松毛虫的生物学特性及其天敌进行了研究。结果表明此虫在内蒙古绰源地区两年一代代占９３％，一年一代占７％。１９９５年调查发现落叶松毛虫的世代在东北及内蒙古有三种情况：１．黑龙江省大兴安岭十八站、呼玛县、新林、松岭等地区的落叶松毛虫为两年一代；２．黑龙江的齐齐哈尔、伊春、佳木斯等地区以南为一年一代；３．内蒙古的绰源、绰尔及黑龙江省的北安、德都、带岭等地区为一年一代及两年一代的交叉地带。幼虫一年一代的为７龄；两年一代的为９龄。天敌有２１种，其中有我国首次发现的落叶松毛虫质型多角体病毒（ＤｓＣＰＶ）和核型多角体病毒（ＤｓＮＰＶ）。此虫于１９９１～１９９４年间在内蒙古大兴安岭地区猖獗成灾，最高虫口密度为４００头／株以上，平均５４头／株，由于此虫两年一代的占９３％，幼虫连续危害２ａ，使小囊虫侵入，造成大片人工落叶松林成片枯死。据绰源林业局调查已有６６７ｈｍ２落叶松林枯死，给林业生产造成巨大损失。
In this paper, the biological characteristics of Dendrolimus paraguay and its natural enemies in Daxinganling area of Inner Mongolia Autonomous Region were studied. The results showed that this worm in Inner Mongolia Chuanyuan area accounted for 93% for two generations, one year generation accounted for 7%. In 1995, the survey found that the generation of the pine caterpillar in the northeast and Inner Mongolia has three situations: 1. Daxinganling 18 stations in Heilongjiang Province, Huma County, the new forest, pine and other areas of the pine caterpillar for two years; Heilongjiang’s Qiqihar, Yichun, Jiamusi and other areas south of the generation; 3. Chuo source in Inner Mongolia, Chuo and Heilongjiang Province, Bei’an, Germany, with the Ridge and other areas for the one-generation and two-generation cross-strait. Seven-year-old larvae of one generation; two-generation of 9-year-old. Among 21 natural enemies, DsCPV and DsNPV were found in China for the first time. The worm was rampant in the Greater Xing’an Mountains in Inner Mongolia between 1991 and 1994. The highest population density was 400 birds per plant or more, with an average of 54 birds per plant. Since the insects accounted for 93% in two generations, the larvae continued to harm 2a, Insects invade, resulting in a large piece of artificial larch forest into pieces die. According to Choyuan Forestry Bureau investigation 667hm2 larch forest has died, causing huge losses to the forestry production.