近几年来,青海省大部分地区林木食叶害虫的危害严重,面积大,势头迅猛。对该省以杨柳科为主的乡土树种而言,严重影响了林木生长,给病虫防治带来很大困难。经森防部门调查,常见的多发性的主要食叶害虫有危害杨树的春尺蛾、柳毒蛾,危害桦树的桦尺蛾、桦三节叶蜂,危害云杉的云杉叶蜂,危害柏树的侧柏毒蛾等。食叶害虫的特点:一是具有强大的繁殖力,产卵集中,发生量大,能主动迁移扩散,传播速度快。在害虫发生盛期,常 In recent years, most areas of Qinghai Province, leafy insect pests serious harm, large area, rapid momentum. In terms of the native tree species in the province, which are dominated by willow branches, the tree growth is severely affected, posing great difficulties for pest and disease control. The investigation by the forest defense department, the common main leaf-eating pests are harmful spring poplar moth, liuyu moth, birch moth endangered birch, birch three leaf bees, spruce hornet endanger the spruce, harm Cypress cypress poison moth and so on. Leaf pests characteristics: First, with a strong fertility, spawning concentration, the occurrence of large, can take the initiative to migrate and spread, spread fast. Occurs in the pest, often