In China, there are approximately 6 million hectares planted with Lolium multiflorum, an important grass in grassland livestock production. A survey of 23 grasslands located across Shandong Province conducted in 2017 revealed that approximately 8% of L. multiflorum plants showed leaf blight symptoms. Most symptoms developed on the leaf margin and began as small, light gray spots. Spots gradually coalesced into larger, irregular lesions and eventually dried and formed extensive necrotic areas. Six samples were taken to the laboratory for isolation. For isolation, pieces were taken from margins of leaf spots, rinsed in water, surface disinfected (5% NaClO solution for 3 min and then 75% ethanol for 30 s), rinsed twice in sterilized distilled water, dried, placed on potato dextrose agar (PDA) medium, and incubated in darkness at 25°C until growth occurred. Newly formed aerial mycelia were transferred to a new PDA plate and incubated at 25°C (16-h photoperiod) for sporulation and morphological observations. Colonies were initially white and then gray-brown with flocculent aerial mycelia. Conidiophores were solitary or clustered, 78 to 135 µm long × 4 to 7 µm wide (n = 50), and conidia were obclavate to ellipsoid or spindle shaped, brown, and measured 27.3 to 40.9 µm long × 13.3 to 17.7 µm wide (n = 50) with three false dissepiments. These characteristics are consistent with the morphology of Curvularia isolates (Mandokhot et al. 1972). For molecular identification, DNA from aerial mycelia of single-spore isolates was extracted using a fungal genomic DNA isolation kit (Sangon, Shanghai, China), and the rDNA internal transcribed spacer was amplified with the primers ITS4/ITS5 (White et al. 1990). Recovered polymerase chain reaction products were sequenced and submitted to GenBank as accession number MH118553. BLAST analysis revealed 99 to 100% identity with previously reported sequences of Curvularia intermedia isolates (GenBank accession nos. KX611668.1, KU856621.1, and KU856625.1). Phylogenetic tree analysis, using ClustalX and MEGA 6.0 software with the neighbor-joining method, also placed the isolates in the clade of C. intermedia with 100% bootstrap support. The identified isolate was used to carry out pathogenicity testing. Plants (six replicates) were inoculated by spraying a conidial suspension (10⁷ conidia/ml), and controls were treated with sterile water. All treatments were incubated in a humid growth environment during the first 48 h at 28°C and then transferred to the greenhouse (25°C, 12-h photoperiod) for observation. Symptomatic plants identical to those described above were observed in all inoculated replicates but not in controls. The same pathogen was reisolated from inoculated plants but not from controls. In China, leaf blight has potential to seriously impact the establishment and productivity of annual ryegrass. To our knowledge, this is the first report of C. intermedia causing leaf blight on L. multiflorum in China.