榆树榆兰金花虫,俗名树虱子,专门蚕食榆树叶子。虫害严重时,一年长出的几茬叶子都被吃光,造成树干稍,甚至全株死亡,严重地影响树木的正常生长。过去多采取树冠喷雾、人工扑打等办法防治榆兰金花虫,但效果都不理想。经几年探索和试验,乐果涂环法防治该虫效果显著。乐果涂环法简便易行,杀虫率高,药效期长,成本低,能减轻环境污染,有利于保护天敌。据测定,用此法连防三年的榆树,第一代虫三年压低虫口密度为75%;第二代幼虫为害程度 Ulmus elm gold flower insects, common name tree lice, specifically eaten elm leaves. When pests are severe, the leaves of several crops grown a year are eaten, resulting in a slight trunk or even whole plant death, seriously affecting the normal growth of trees. In the past to take crown spray, artificial swatting and other measures to control Ulmus, but the effect is not satisfactory. After several years of exploration and testing, dimethoate ring method to control the pest significant effect. Happy dimethoate method is simple, insecticidal rate, long duration, low cost, can reduce environmental pollution, is conducive to the protection of natural enemies. According to the determination, with this method even three-year-old elm, the first generation of insects in three years to reduce the population density of 75%; second-degree larvae degree of harm