杉木细菌性叶枯病在南方杉木林区一般均有发生、严重者可使杉木针叶和枝梢枯死,对杉木生长影响很大。该病的病斑特点是:将病叶对光视之,四周有晕圈(枯死叶无此特点),但因品种和生态环境不同,症状反应也不一致。因此,仅根据症状诊断并无把握,一般要进行镜检,有时还要采取分离培养的方法来鉴定。最近,我们在工作实践中 Fir bacterial bacterial blight in the southern Chinese fir forest area have occurred in general, can make fir needle and shoots dead serious, greatly affected the growth of Chinese fir. The characteristics of the disease lesion is: the sick leaves on the light as the surrounding halo (dead leaves no such characteristics), but because of different species and ecological environment, the symptoms are not the same. Therefore, the diagnosis based solely on symptoms and not sure, the general microscopic examination, and sometimes to take isolation and culture methods to identify. Recently, we are working in practice