Triadica sebifera (L.) Small (Euphorbiaceae), commonly known as the Chinese tallow tree, is an endemic deciduous species of significant economic importance in China (Gao et al. 2016). In October 2023, leaf spot disease was observed on T. sebifera in the Longquan Mountain planting area (30.56°N, 104.27°E), Sichuan Province. Field surveys were performed across three representative planting plots, where a total of 150 trees were randomly examined (50 trees per plot). The mean disease incidence was