First report of Sclerotinia nivalis causing white mold disease on Sedum sarmentosum in China.
In 2010 and 2011, a disease exhibiting characteristics of white mold was found on Sedum sarmentosum, a crassulaceous weed under canopies of tea trees, in Zhushan County, Hubei Province, China. Based on the cultural and morphological characteristics, the pathogen was identified as Sclerotinia nivalis Saito. In the phylogenetic tree inferred from the internal transcribed spacer (ITS)-rDNA sequences, the pathogen was clustered with five previously characterized isolates of S. nivalis, forming a unique clade, thus confirming the morpho-cultural identification. Koch's postulates were fulfilled by pathogenicity tests using the isolate SsSn-24 and Let-19 of S. nivalis on plants of S. sarmentosum. To our knowledge, this is the first report of S. nivalis on S. sarmentosum in the family Crassulaceae.