Symptoms:

Eyespot can show up throughout the growing season. Lesions are roughly ⅛-¼ inch in diameter and will look water soaked circular spots and will be in clusters. The leaf tissue in the center of each spot will die and turn a tan color with a brownish purple ring around it. Every spot is also surrounded by a yellow halo, when held up to the light it can be seen clearly.

 

Scouting: V6-R4

Eyespot overwinters in corn residue and when in wet conditions it will produce spores that can be spread by wind and rain. This disease is more common in field with a history of Eyespot, corn following corn, reduced tillage and favors cool temperature roughly 70 degrees with wet conditions.

 

Management: 

  • Plant resistant hybrids
  • Crop Rotation
  • Tillage will break up the residue and allow the microbes within the soil to break down the residue faster.
  • Fungicides are labeled for use against Eyespot.