几年来,杨树腐烂病逐年有所蔓延。此病不但影响树木的生长,甚至引起整株死亡。以钻天杨、小叶杨被害严重,其中又以插条植株比实生苗所培育的植株发病率高。在银川、中卫两地的观察,病原中主要是其菌的子囊菌及其无性世代孢子。病菌借 In recent years, poplar rot has been spreading year after year. The disease not only affects the growth of trees, and even cause death of the whole plant. In order to drill Tian Yang, Populus serious damage, of which the cuttings are more than the seedlings of plants grown high incidence. In Yinchuan, Zhongwei two observations, the main pathogen is the bacteria ascomycetes and their asexual generation of spores. Germs borrow