This study mainly identified pathogen of a new canker, which has been observed on stem and branch of Populus xeuramericana cv.'74/76' and P.×euramerican 'zhonglin 46' in Henan, Shandong Province and Tianjin City. Pathogens were isolated from the infected tissues, and pathogenicity test, fungicide bioassay and a preliminary survey of pathogenesis reqularity were conducted. The main research conclusions were as follows:
1. The disease is characterized by canker with white exudates dripping the bark appea...