Northern corn leaf blight

Initially small, water-soaked spots appear on leaves, then elliptical brown areas develop until nearly as wide as the leaf. In the final stages, lesions are straw-coloured to grey, coalescing and killing large parts of the leaves. The margin is tan on maize and red-purple on sorghum depending on the variety. Infection on maize may include tassels, ears, crowns and seedlings. Symptoms on resistant cultivars are reduced to small chlorotic or necrotic spots. Northern leaf blight of maize and sorghum forms larger and fewer lesions than Cochliobolus heterostrophus, mostly on the leaves but also on the stalks of sorghum.