杨树烂皮病又称腐烂病、臭皮病、出疹子,危害杨树干枝,引起皮层腐烂,导致造林失败和林木大量枯死。在我国山东、安徽、河北、河南、江苏等省普遍发生,除危害杨树外,也危害柳树、榆树、槐树等其他树种。此病传染性极强,病害流行,往往造成林木大片死亡,损失很大。其病因是由于树苗携带的或林间病株上的病原真菌的传播,与施用叶面肥、化肥、杀虫剂等无关。一、杨树烂皮病的发病症状1、干腐型主要发生于主干、大枝及分叉处。发病初期呈暗褐色水渍病斑,略肿胀,皮层组织腐烂变软, Poplar rot disease, also known as rot disease, sore skin disease, rash, endangering poplar branches, causing cortical decay, resulting in afforestation failure and a large number of dead trees. In our country Shandong, Anhui, Hebei, Henan, Jiangsu and other provinces generally occur, in addition to endangering poplar, but also endanger willow, elm, locust and other tree species. The disease is extremely contagious and disease-prone, often resulting in large-scale forest deaths, a great loss. Its etiology is due to the spread of pathogenic fungi carried by saplings or diseased plants, not to the use of foliar fertilizers, fertilizers, pesticides and the like. First, the symptoms of rotted bark disease 1, dry rot occurs mainly in the trunk, branches and bifurcation. The early onset of dark brown water stain lesions, slightly swollen, cortical tissue softening,