Eye spot of Corn

Symptoms. The first visible symptoms of eyespot are small, circular spots (1/16' to 1/8" diameter) that are water-soaked with yellow halos on leaves. These can occur as early as the V3/4 stage of vegetative growth. These lesions develop into an "eyespot", which is a tan spot surrounded by a brown to purple ring and narrow yellow halo. The spots can be scattered on leaves, but often appear in patches and can join together to form large necrotic areas. Lesions can sometimes develop on leaf sheaths and husks. The spots may sometimes be confused with a physiological or a genetic leaf spot.
Conditions and Timing that Favor Disease. The pathogen favors cool temperatures, humid and wet conditions, continuous corn, conservation tillage, and susceptible corn hybrids/inbreds.