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在新疆城市绿化及农田防护林带中,杨树占重要位置。多年来由于杨树受病虫侵害,特别是钻天杨和箭干杨受杨盾蚧的为害最重,有的地方已逐渐被其它树种淘汰的趋势。杨盾蚧寄生数年后,林势便衰退,严重时成为枯立木。介壳虫终年着生在树干和枝条上,随苗木的转运至其它城市和农场,因之广泛的传播,已成为三北防护林带主要害虫之一。此蚧在新疆各地均有发生,在哈密、吐鲁番、库尔勒、乌鲁木齐、石河子等地为害已久,且日趋严重,是绿化工作中一个急需解决的问题。
In Xinjiang’s urban greening and farmland shelterbelt, poplar occupies an important position. Over the years as a result of poplar by pests and diseases, especially the drilling days Yang and Arrow dry Yang by the most vulnerable to snakehead insects, and some places have been gradually eliminated by other species trends. After a few years of parasitism Yang shield, the forest will decline, in serious cases become dead trees. Scale insects born in the trunk and branches all year round, with the seedlings transported to other cities and farms, because of its widespread dissemination, has become one of the major pests in the Three North Shelterbelt. This scale has occurred all over Xinjiang and has long been harmed and harmed by a long time in Hami, Turpan, Korla, Urumqi and Shihezi areas. It is an urgent problem to be solved in the afforestation work.