Northern leaf spot, Race 3. Gray leaf spot is now evident on lower leaves in many southern Iowa fields, but it appears to be less prevalent than last year at this time. If field corn producers are considering a Tilt application for gray leaf spot, now is the time to be scouting fields. Seed producers should be well into their gray leaf spot scouting by now. Gray leaf spot symptoms.
Eyespot causes small, round spots with a brown border surrounded by a a yellow halo.
Control of these diseases is mainly accomplished through resistance, crop rotation, and crop residue management. This information subject to a usage policy .