Curvularia Leaf Spot
(Curvularia lunata)

Curvularia Leaf Spot 1

Symptoms: Starts as very small, round, tan lesions on leaves. Lesions often have a brown border and can be surrounded by a yellow halo.
Risk Factors:  Overwinters in corn residue and is splash- or wind-dispersed to new corn plants. Disease severity will be higher in fields of continuous corn and/or fields using conservation tillage practices. Warm, humid conditions favor disease development.
Management: Avoid planting into residues from previously diseased plants.