梨齿盾蚧 Quadra spidiotus perniciosus(Comstock)过去记载多为害果树,而1984年在我市的寿光县发现为害杨树,继而在全市各地陆续发生。1985年后全省各地在杨树上也相继发现虫情,并造成了严重危害,使杨树生长面临严重威胁,为有效地控制该虫蔓延趋势,保护杨树资源,山东省林业厅于1988年将该虫列为检疫对象。几年来对梨齿盾蚧的发生危害以及检 Quadra spidiotus perniciosus (Comstock) recorded in the past more harmful fruit trees, and in 1984 found in Shouguang County, poplar damage, and then one after another in the city. After 1985, poplar trees were also found in different parts of the province, which caused serious damage to poplar trees. In order to effectively control the spread of poplar trees and protect poplar resources, the Forestry Department of Shandong Province in 1988 Year of the insect as a quarantine object. Over the past few years Pear teeth shield scale occurrence and seizure