Maize northern leaf blight (226)
Pacific Pests, Pathogens and Weeds
- Worldwide distribution. On maize, sorghum and wild grasses. An important disease.
- Large, oval, grey or light brown, spots, 25-150 mm, sometimes with dark margins. Spots merge. Brown spore masses in rings. Leaves dry out and die.
- Spread is by rain splash and wind.
- Cultural control: resistant varieties; adequate amounts of P and K, but do not over supply N; weed, especially grasses; crop rotation; collect and burn trash after harvest.
- Chemical control: unlikely to be economic; if needed use chlorothalonil and mancozeb.
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