我省分布的落叶松毛虫、油松毛虫和赤松毛虫,7月中旬前后产卵繁殖,卵多产于树冠中、下部外围针叶上,卵成块状,每个卵块数十或数百粒不等。7月下旬始见幼虫,初孵幼虫体小,黑褐色,在松针上群集如蚂蚁状,直至三龄以后才分散活动,人们常将1～2龄群集为害的松毛虫幼虫称为“蚁子”。“蚁子”在树冠上集中成团,极 Dendrolimus caterpillars, pine caterpillars and dendrolimus caterpillars distributed in our province oviposited around mid-July. The eggs were prolific in the middle of the canopy, and the lower outer conifers were in the form of lumps of eggs. The number of eggs per dozen or hundreds Do not wait. In late July, the larvae were seen. The newly hatched larvae were small and dark brown in color. They were clustered on the pine needles like ants and dispersed until after the third instar. The larvae of the caterpillars 1 ~ 2 were often called “ant ”. “Ants” in the canopy concentrated into groups, very