松毛虫在北方地区有集中下树越冬的生活习性,越冬的场所多集中在树皮缝和树干基部周围的石块下,土壤缝隙及杂草丛中,越冬的形式多呈团状分布。根据这一特性,北京林业大学连续3年在北京市密云县油松纯林中,对5000株松树进行了铺石块诱虫试验,取得较好效果。每株树下的石块平均诱虫率达84.7％,最多的一块诱虫达1000多头。这 Dendrolimus has the habit of concentrating the trees to winter in the northern part of the country. The overwintering places are mostly concentrated in the barks and barks around the base of the tree trunk. According to this characteristic, Beijing Forestry University for three consecutive years in Miyun County, Beijing pure pine forest, 5000 pine trees were trapped stones, and achieved good results. The average trap of trees under each tree reached 84.7% and the largest one was more than 1,000. This