Abstract:From 2017 to 2021, diseased leaves of gray blight on Camellia sinensis were collected from tea plants in Fujian and Anhui provinces, and the pathogens of tea gray blight were obtained and identified by morphology characteristics, multi-loci sequence analysis and Koch’s postulate test. The results indicated that a total of 40 isolates showed four types in colony morphology. The conidia were similar, and they were spindle shaped, straight or slightly curved, with three brown cells in the middle and transparent cells at both ends. Based on the PCR amplification, sequencing and multi-loci sequence analysis of ITS, TUB2 and TEF genes for representative isolates, they were identified as Pseudopestalotiopsis camelliae-sinensis and Ps. chinensis, respectively. This was the first report of Ps. chinensis causing gray blight on C. sinensis in Fujian Province. Furthermore, it was determined for the sensitivity of the pathogen to three fungicides in this study. The results showed that the tested isolates had the highest sensitivity to difenoconazole, with an EC50 value of 0.035 0 - 0.267 5 μg·mL-1, followed by tebuconazole and carbendazim, with an EC50 value of 0.126 3 - 1.582 6 μg·mL-1. In conclusion, difenoconazole and tebuconazole can be selected as the priority to control gray blight disease of C. sinensis.