, a New Species Causing Gray Leaf Spot Disease in .

This study identified a new species () that causes gray leaf spot (GLS) disease in cultivated . This fungal species was isolated from the affected region of GLS on leaves. Pathogenicity bioassays were conducted based on Koch's postulates. Morphology was examined based on the features of conidiomata, conidiogenous loci, conidia/conidiophores, and conidiogenous cells. The rDNA internal transcribed spacer region, calmodulin, translation elongation factor 1-alpha, and histone genes were subjected to phylogenetic analysis using the MrBayes tool in Phylosuite. Bootstrap support analysis for phylogenetic placement confirmed the new species, which was significantly different from the closely related species and . The morphological characteristics also supported this finding, with the conidiogenous cells of being considerably shorter than those of or . In addition, was distinguished by its cultural characteristics. As this fungus was isolated from , it was named F.Q. Yin, M. Liu & W.L. Ma, sp. nov. The type specimen (H8-2) was preserved at the China General Microbiological Culture Collection Center. This is the first report of GLS caused by on leaves in China. The current study enriches the knowledge regarding sp., contributes to the identification of a species causing GLS in , and provides useful information for the effective management of this disease.