旱柳是榆林地区风沙沿线的主要造林树种。近年来,很多地方旱柳林受蚧的危害,并引起柳树枝梢死亡,严重威胁柳林正常生长。为了摸清这一虫害发生、危害规律,寻找防治途径,1974年3—8月,我们对该虫初步进行了一些观察和防治试验。 The willow is the main afforestation species along the sandstorm in Yulin area. In recent years, many places of Danliulin suffer from scale, and cause the death of willow branches, a serious threat to the normal growth Liulin. In order to find out the occurrence of pests, endanger the law, look for ways to prevent and control, March-August 1974, we initially conducted some observations and control experiments.