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梨圆蚧种群变动规律及防治技术研究李明贵，陈玉娟，何绍春，曲树勤（丹东市森防检疫站１１８０００）近年来，丹东地区由于梨圆以（梨笠圆盾蚧）（ＱｕａｄｒａｓｐｉｄｉｏｔｕｓｐｅｒｎｉｃｉｏｓｕｓＣｏｍｓｔ．）的为害，造成白榆生长衰弱以致枯死。据调查，东港市...
In recent years, Dandong area due to Pear circle to (Pestalotiopsis quadripid.) (Pestalotiopsis quadrimeditorus) damage , Resulting in weak growth of elm so dead. According to the survey, Donggang City ...