Eyespot is a foliar corn disease. The fungus overwinters in residue, making it more prevalent under continuous corn and reduced tillage systems. Disease development is favoured by cool, wet conditions. Infection can occur throughout the growing season, generally infecting the oldest, lower leaves first and progressing up the plant. Damage from eyespot usually looks worse than it actually is, though yield loss is possible if the disease reaches the upper leaves of the plant.