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Spot-causing fungal disease occurring mainly in the warm regions. The lesions are ash white with brown border and short spindle-shaped. The lesion size is about 2-5mm, but soon they fuse mutually and cause leaf blight of the entire leaf. The causal fungus is a same species of rice blast, and they cross frequently on the artificial medium. The fungus is also close to that of ryegrass phylogenetically, but the pathogenicity is differentiated and it is hard to infect ryegrass. Microconidia of phialo-tye sometimes produced. |
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Fungal disease that causes spots on leaves. The lesions are at first brown, oval to spindle-shaped small ones. Later they begin to expand and elongate along the leaf vein and reach to 20-30 cm long. Dense mycelial mass are frequently produced on the surface of the lesion and show sooty mold. The pathogen is same with that of leaf blight of goosegrass. |
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The disease firstly occurs in the ground side of stem around the rainy season and progresses up through sheaths. The lesion becomes cloud-shaped, ash white with brown border. Brown sclerotia with a smooth surface are produced on the lesion at the latter stage of the occurrence. They drop to ground, and become the primary inocula of next year. It occurs severely under high temperature (especially 30C or more) and high humidity condition. The pathogen is common in summer blight of pastures and sheath blight of rice, corn and sorghum, etc.
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