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Fungal disease occurring in heads of quackgrass (Agropyron repens) in cool places. The host plants often become dominant in Hokkaido, the most north region of Japan, and are sometimes utilized as forage. The damage becomes distinct from June to July. The brown to black powdery stripes are formed on the leaf. The surface of the lesion tears and exposes black powder, the smut spores, and they disperse by wind and rain. The smut spores are light brown to brown, spherical to sub-spherical, and usually surrounded by infertile cells. |
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