蚧壳虫是林木三大顽固性害虫之一。其对杨树的危害方式主要是以若虫和雌成虫群集固定在杨树的主干和枝条上吸食养分为害,自小枝到主枝均可受害,2～3年生枝受害最重,发生严重时整个枝条被虫体覆盖,并可重叠成层,远看像涂了一层白蜡。污染叶面和枝条,堵塞气孔、皮孔,影响光合作用。被害处由于不能正常生长发育而凹陷,使受害枝条的皮层凹凸不平,发育不良,树势衰弱,枯枝增多,枝条严重被害后,逐渐干枯,风季造成大批风折,使整株早衰至全株死亡。由于蚧壳虫类体表常披有蜡质物或有蚧壳覆盖,如用药物对它直接喷洒,一般农药难以奏效,且以刺吸式口器取食,吸取植株的汁液,因而对林木造成极大的危害,给防治工作带来一定困难。新疆克拉玛依市开发区在生产上采用人工防治、生物防治与化学防治相结合的综合治理过程中,总结出一套较理想的防治方法。 Scale insects are one of three stubborn pests of trees. Its harmful way to poplar is mainly nymphs and female adults clustered in poplar trunk and branches on the nutrient absorption damage, from the branchlets to the main branch can be affected, 2 to 3 years the branch damage most serious in the event of a serious Branches covered by parasites and can be stacked into layers, far looks like a layer of coated white wax. Pollution of foliage and branches, blocking stomatal, lenticel, affecting photosynthesis. Because of the damage can not be normal growth and development of depression, so that damaged branches of the cortex rugged, dysplasia, frail weakness, increased branches, branches severely victimized, gradually dried up, windy season caused a large number of winds, the whole plant premature senility to the whole Strain died. As scale insects are usually covered with waxy body surface covered with shellac or shelled, such as drugs directly sprayed on it, the general pesticide is ineffective, and sucking mouthparts feeding, drawing plant juice, and thus the forest Causing great harm to the prevention and control work to bring some difficulties. Karamay City, Xinjiang Development Zone in the production of artificial control, biological control and chemical control combined with a comprehensive management process, summed up a set of more ideal method of prevention and treatment.