重阳木在南京地区是一种较常见的行道木。近年来在南京北郊西善桥沿河岸数里的重阳木上严重发生丛枝病,发病率高达80％以上,且多为重病树。其枝条和茎干都丛生小枝,叶片变小,不到正常叶片的1/10,有的病树发病期间出现红叶症状。入冬后病树渐枯死,次年 Chongyang wood in Nanjing is a more common sidewalk wood. In recent years, in the northern suburb of Nanjing, Xishan Bridge, a few miles along the banks of Chongyang wood serious catarrhal disease, the incidence of up to 80% or more, and mostly sick tree. Its branches and stems are clustered twigs, leaves smaller, less than 1/10 of normal leaves, and some sick leaves during the onset of symptoms of red leaves. After the winter sick tree gradually wither, the following year