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51.
In order to confirm the pathogen of branch blight on pearl plum and its virulence, 14 samples were collected from Guangxi and Guizhou Province, and 21 isolates were obtained and were identified as Botryosphaeriaceae. The results of colony morphology, conidial observation and molecular identification of internal transcribed spacer region (ITS1-5.8S-ITS2) and the translation elongation factor 1-α (EFl-α) showed that the pathogens of branch blight on pearl plum were Botryosphaeria dothidea (66.67%), Neofusicoccum parvum (19.05%), N. algeriense (9.52%), and Lasiodiplodia pseudotheobromae (4.76%). The pathogenicity of different species of Botryosphaeriaceae was tested by mycelial dishes inoculation, and it was found that typical isolates of the four species were pathogenic, among which L. pseudotheobromae was the most virulent one and B. dothidea was the weakest one. This is the first report that L. pseudotheobromae causes branch blight on pearl plum. 相似文献