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.
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.
- 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.