Abstract: Experimental results show that the suitable growth temperature of Botryodiplodia populea Z.K.Zhong is 20—25℃, the suitable pHis 6—7, and potato dextrost agar and malt agai media are suitable for its growth. The bark produces disease spot during the second and last ten days of April, and the conididia appear in the first ten days of May. The conididia gradually mature, split and spill over the conididia after the second ten days of May. The fungus overwinters in the bark with mycelium. Through the fungicide selection in the laboratory, the biological fungicide 660Bshows the best result for controlling the pathogen.

Key words: Poplar, Canker disease, Pathogen, Biological characteristics