Occurrence of Root Rot of Panax notoginseng Caused by Fusarium oxysporum in China

摘要

A root rot disease was found in Panax notoginseng plantations based in Guizhou province in 2015 and 2016. This disease affected mainly P. notoginseng rhizomes and leaves, causing oval or irregular spots, finally resulting in the infected plants withering and dying. We collected twenty-five infected rhizome samples of P. notoginseng from Guizhou province. The pathogen was identified as Fusarium oxysporum based on the morphology and molecular characterization including rDNA ITS, and EF sequence analysis, High throughput sequencing and Maximum Parsimony of the pathogen was conducted. In addition, we investigated the occurrence and frequency of P. notoginseng root rot in Guizhou province, and found that temperature and humidity were the main factors influencing P. notoginseng root rot. In addition, high light levels and lack of crop rotation were also associated with the occurrence of P. notoginseng root rot.