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二、林木病害检疫对象 (一) 杨树溃疡病在杨树枝、干上发生的溃疡病,系由细菌或真菌引起。细菌性溃疡病于1934年最初发现于英国,之后在很多国家造成大害。国内,自1955年开始,陆续在各地发现,当时认为是细菌性溃疡病。根据近年研究结果,其中绝大多数已被证实是由真菌引起的。因此,仅介绍真菌性溃疡病。 1.分布及为害此病分布广泛,北京、河北、河南、辽宁、吉林、黑龙江、陕西、甘肃、江苏、山东等省均有发生。我省曾在白城、洮安、扶余、农安、双阳等市县发现这一病害。杨树溃疡病可为害多种杨树,蔓延迅速。从幼苗到大树都有发病,对大苗及新造的杨树
Second, the object of forest disease quarantine (A) poplar canker disease in the poplar branches, stem ulcer disease occurred, caused by bacteria or fungi. Bacterial ulcer disease was first discovered in Britain in 1934, and then caused great harm in many countries. Domestic, from 1955 onwards, one after another found in various places, was considered to be bacterial ulcer disease. According to recent research results, the vast majority of them have been confirmed to be caused by fungi. Therefore, only fungal ulcer disease is introduced. Distribution and damage The disease is widely distributed in Beijing, Hebei, Henan, Liaoning, Jilin, Heilongjiang, Shaanxi, Gansu, Jiangsu, Shandong and other provinces have occurred. The province has found the disease in Baicheng, Fuan, Fuyu, Nong’an, Shuangyang and other cities and counties. Poplar canker disease can damage a variety of poplar, spread rapidly. From the seedlings to the trees have the disease, the big seedlings and new poplar