森林病虫害对林木的危害往往不被人们注意,尤其是那些只在局部地区分布、比较隐蔽或不易被发现的危险性病虫,常通过人为活动迅速传播,造成灾害后才引起重视。近年来,一些危险性病虫在国内传播蔓延,有的在生产上已造成了严重的损失,其中有三种森林植物检疫对象对我区的林业生产威胁极大,必须严加防范。 Forest pests and diseases often do not pay attention to the hazards of trees, especially those pests which are only distributed in some areas and are relatively invisible or not easy to be found. They are often spread rapidly through human activities before they cause disasters. In recent years, some dangerous pests spread and spread in the country, and some of them have caused serious losses in production. Among them, three kinds of forest plant quarantine objects have a great threat to forestry production in our region and must be strictly prevented.