杨树溃疡病(Dothiorella gregaria)是杨树重要枝干病害,可在定植后的幼树主干上形成大型溃疡斑,常导致幼树死亡。1987年辽宁省康平、法库、昌图三县因此病损失的幼树近200万株,仅苗木费一项经济损失达70万元左右。1988年铁岭市发病面积近5万亩,损失幼树132万余株,经济损失达42万余元。为尽早控制此病危害,我们于1988～1989年在昌图县红 Dothiorella gregaria is an important branch disease of poplar and can form large-scale ulcer spots on the trunk of colonized saplings, often leading to the death of saplings. In 1987, about 2 million saplings were lost in Kangping, Faku, and Changtu counties in Liaoning Province. Only an economic loss of seedlings cost about 700,000 yuan. Tieling City, 1988, the incidence of nearly 5 million mu area, the loss of more than 1.32 million saplings strains, the economic losses of 42 million yuan. As early as possible to control the harm of the disease, we in 1988 to 1989 in Changtu County Red