一、杨柳树食叶害虫 杨柳树病虫种类较多,据近年来普查统计,害虫100多种。其中杨柳树食叶害虫据统计约70多种,占杨柳树害虫种类总数的70％左右。这些害虫从早春开始直到晚秋都食害树叶,对杨柳树的健康生长威胁很大。现将其中普遍发生,严重为害的杨毒蛾及杨细蛾的主要生物学特性及对这一类害虫的防治方法,简介如后: First, the Willow Tree leaf insect pests willow species more pests, according to census statistics in recent years, more than 100 kinds of pests. Among them, about 70 species of poplar willow leaf insect pests, accounting for about 70% of the total number of species of willow tree pests. These pests eat leaves from early spring until late autumn, threatening the healthy growth of willow trees. The general biological characteristics of poplar moths and poplar moths, which are prevalent and severely damaged, are summarized as follows: