Gray Leaf Spot
A fungal disease of corn caused by Cercospora zeae-maydis (also called Cercospora leaf spot), producing lesions bound by leaf veins.
Affected Plant
Corn (maize)
Severity
Moderate to High
Symptoms
- Small tan to brown rectangular lesions bound by leaf veins
- Lesions may merge and turn gray as they mature
- Premature death of lower leaves in severe cases
Causes
- Fungal infection favored by warm, humid weather
- Survival of the fungus in corn residue left on the soil surface
- Continuous corn planting in the same field
Prevention
- Rotate crops away from corn
- Manage or till under corn residue
- Choose resistant hybrids where available
Management
- Apply fungicide in high-risk fields per local extension guidance
Related Corn (maize) Diseases
Think your plant might have Gray Leaf Spot?
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Diagnose Your PlantDisclaimer: This is an AI-generated result and not a replacement for expert agronomic or plant-pathology diagnosis. Confidence scores reflect the model's certainty, not biological ground truth. The model was trained and evaluated on leaf photos captured under controlled, lab-like conditions, so accuracy on real-world field photos (cluttered backgrounds, variable lighting, multiple or overlapping leaves) may be lower than the reported evaluation metrics.