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Causal organism - Rhizoctonia cerealis
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Wheat, barley, oats, rye and some grass species.
The characteristic symptoms of the disease are the sharply defined lesions on the outer leaf sheaths. Young lesions have a sharply defined dark margin and frequently have shredding of the epidermis within the lesion. Multiple lesions up the stem are often found up to 30cm from the stem base. Later in the season lesions on the stem have a pale cream centre with a dark brown, sharply defined edge. Sharp eyespot lesions are often superficial, but severe sharp eyespot is not uncommon and can cause whiteheads or lodging.
