一、发生规律及生活习性一年发生一代,以幼虫在卵内越冬,翌年5～6月落叶松发芽时孵化,幼虫有吃卵壳的习性,树上留卵块痕迹。幼虫刚孵出后,成群停留在树干上,当气温高,天气睛朗时,在树上停几小时,气温低而多雨的天气则停几天,逐渐爬到树冠上开始取食,不在寄主树种上孵出的幼虫吐丝悬垂,借风吹扩散传播,7月间,老熟幼虫开始在树干上,树洞内或枝 First, the occurrence of laws and habits One generation a year, with larvae in the egg overwinter, 5 to June the following year Larvae hatch when germinated, the larvae eat eggshell habits, leaving traces of eggs on the tree. When the larvae are newly hatched, they stay in the trunk. When the temperature is high and the weather is sunny, they stop for a few hours in the trees. The weather is low and the rainy weather stops for a few days. Gradually climb to the canopy to begin feeding. The larvae hatched on the host tree shed their drooping silk and spread by wind and spread. In July, the mature larvae began to grow on the trunk,