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Wheat, the powdery mildew that infects barley will not infect wheat and vise versa.
Light green flecks develop on the leaves, stems, and heads, gradually developing into white-gray cotton-like patches. Small, dark, fruiting bodies develop inside the lesions.
Herbicide injury due to bipyridyliums
Over fertilizing with nitrogen can induce heavy, succulent susceptible growth. Lighter seeding rates improve air circulation and decrease disease. Crop rotations and clean plowing reduce the amount of overwintering inoculum in the field; airborne inoculum can negate these practices.