杨树溃疡病Dothiorella gregaria Sacc.是杨树干部的一种重要病害,已对我国杨树人工林的发展造成了严重威胁。该病从1955年在北京市个别苗圃发现以来,现已传播到东北、华北、西北、华东等地10多个省市。从作者在辽宁省的发病凋查情况来看,几乎全省杨树人 Poplar canker disease Dothiorella gregaria Sacc. Is an important disease of poplar cadre, which has posed a serious threat to the development of poplar plantation in our country. Since the disease was discovered in individual nurseries in Beijing in 1955, the disease has spread to more than 10 provinces and cities in northeast China, north China, northwest China and east China. From the author’s incidence in Liaoning Province witnessed the situation, almost all poplar people in the province