天幕毛虫俗称春粘虫、顶针虫、毛毛虫等,辽宁省各县均有发生,主要为害果树、柞树以及杨、柳、榆、槐等阔叶树木.在大发生年份,常将树叶吃光.据1984年调查,辽宁省因此虫为害造成的经济损失达3,700余万元.天幕毛虫一年发生一代. 越冬的小幼虫于翌年4月中旬开始孵化,5月下旬、6月上旬结茧化蛹,6 The celestial caterpillars are commonly referred to as spring armyworms, thimble insects, caterpillars, etc. All occurrences occur in all counties of Liaoning Province, mainly affecting fruit trees, oak trees, and broad-leaved trees such as poplar, willow, elm and locust. According to the survey in 1984, the economic losses caused by pests in Liaoning Province amounted to more than 3700 million yuan. One generation occurred in the cemetery caterpillars a year. The overwintering young larvae began to hatch in mid April of the following year, and cocoon pupation in late May and early June 6