First report of Ceratobasidium sp. AG-I (binucleate Rhizoctonia) causing root rot of Hedychium coronarium Koen in China

摘要

Hedychium coronarium Koen is a perennial flowering plant that has ornamental, nutritional and medicinal value. In October 2019, root rot symptoms were observed in fields of H. coronarium in Yunnan Province, China. Fungal isolates were obtained from the diseased samples and the pathogenicity was confirmed by fulfilling Koch's postulates using wounded and unwounded plant inoculations. The pathogen was identified as Ceratobasidium sp. (binucleate Rhizoctonia) through morphological characterization and anastomosis grouping as well as sequence analysis of both rDNA-ITS and EF-1 alpha. To our knowledge, this is the first report of Ceratobasidium sp. AG-I (binucleate Rhizoctonia) causing root rot on H. coronarium.