Corn Diseases in Ohio

Northern corn leaf spot

• Symptoms
  • lesions are variable in size and shape, may be circular, oval or linear and range from flecks up to 3/4 inch long
  • tan to brown in color
• Environment
  • favored by warm humid conditions with heavy dews.
• Survival
  • fungus survives on corn residues and spores are spread by wind and rain.
• Management
  • resistant hybrids
  • seldom prevalent enough to depress yields except on inbreds or no-till continuous corn.
• Scouting