Abstract
Salix matsudana Koidz. is a popular ornamental tree in China and extensively cultured throughout Asia. It is renowned for its remarkable adaptability to challenging conditions, high biomass, rapid growth, and flood tolerances. In October 2022, a leaf blotch disease was observed in Rudong City, Jiangsu, China. This disease significantly impacted the ornamental and ecological value of the host tree. Fungal isolates, obtained from symptomatic leaves, were confirmed to be pathogenic to S. matsudana following pathogenicity tests. Phylogenetic analysis using seven loci (ITS, SSU, RPB2, LSU, ALTα-1, TEF1-α and GAPDH) and morphological characterization of the nine isolates revealed that they belonged to Alternaria alternata, Alternaria arborescens, and Alternaria koreana. This study represents the first study of Alternaria causing leaf blotch in S. matsudana. It provides valuable insights for disease management and enhances our understanding of Alternaria species diversity in China.
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