species isolated from golf turfgrass in China, with description of , sp. nov.

Leptosphaerulina leaf blight occurs on most turfgrasses. Hitherto, species associated with this disease include , and . However, following Koch's postulates, was confirmed as saprobes but not pathogens, and the other three species have not been tested. The pathogenicity of spp. is still questionable. In this study, we isolated 19 strains from diseased golf turfgrasses in China, and they were identified as , and a new species, , through multilocus (ITS, 28S, , and ) phylogenetic analyses and morphological observations. Pathogenicity test revealed that the three species identified in this study cannot infect live/healthy turfgrass tissues of and and only produced pseudothecia on the dead leaves of stressed seedlings. Considering the results of pathogenicity tests in this and previous studies, we speculate that most species isolated from diseased turfgrass are not pathogens but saprobes. Applying proper management practices to prevent severe turfgrass stress is a key measure to reduce or eliminate the effects of on golf turfgrass.