First report of Leaf Spot on Welsh onions ( Allium fistulosum L.) Caused by Stemphylium vesicarium in China
In September 25, 2025, numerous symptoms resembling leaf spot were observed on the leaves of Welsh onions planted at the Beijing Academy of Agricultural and Forestry Sciences (39°57′N, 116°18′E). Samples were taken from the diseased leaves. The lesions mostly appeared at the leaf tips and middle parts of the leaves, ex...