白蜡绵粉蚧（PhenacoccusfraxinusTang）自１９９６年犤１～３犦相继传入西宁市以来，短短的３～４a时间就蔓延至西宁市各行政区，为害白蜡树相当严重，为害株率高达９６％，为害程度达到中度以上的街区占调查街区的７８％。目前已成为白蜡树上的１种重要的刺吸性害虫，为害日 Phenacoccusfraxinus Tang has spread to all administrative districts of Xining since its introduction from 1983 to 2009 in Xining City. The damage of ash tree is very serious with the strain rate of up to 96% 78% of the surveyed neighborhoods were affected by the districts where the degree of harm was moderate. It has become an important puncture on the ash tree sucking pests, damage day