Corn Leaf Blight

Northern and Southern Corn Leaf Blights are fungal diseases that produce yellow, gray or tan oval spots and yellowing of leaves. They are most problematic in warm, wet conditions.

The usual fungal control measures should be used. Make sure the soil is well-drained, avoid wetting the leaves (or at least water when they can dry out quickly). Keep the soil clear of crop debris. Supply plenty of compost. Rotate crops annually. If this becomes a recurrent problem the simplest solution is to use resistant cultivars.

Image: Department of Plant Pathology Archive, North Carolina State University, Bugwood.org