Description: Lesions resemble elongate rectangles on leaf surfaces. Lesions have straight or parallel sides. Susceptible type lesions may be from 1/2?4" long and tan to gray in color with no borders. Some less susceptible hybrids have yellow halos surrounding small lesions (chlorotic lesion type).

Location: The disease can be found throughout the state at some level, but is most prevalent in east central, southern and western Ohio. Severe epidemics occur in continuous corn, reduced tillage fields in river bottoms or in locations with restricted air drainage. Lodging may result from excessive leaf blighting.

Time of attack: The disease is favored by heavy dew, fog or light rain. Periods of drying between these periods also is important. Lesions generally first appear near tasseling and disease spread occurs until maturity.

Management:
· Resistant hybrids
· Till residues
· Crop rotation
· Fungicide application on susceptible hybrids in chronic disease areas