Gray Leaf Spot of Corn
Cercospora zeae-maydis
Maizefungal
An economically important fungal disease producing rectangular, vein-bounded lesions that can cause severe defoliation.
Symptoms
Rectangular, tan-to-gray lesions bounded by leaf veins, capable of causing severe defoliation in favorable weather.
Favorable conditions
- •Warm, humid weather with extended leaf wetness
- •Reduced tillage that leaves infected residue on the surface
Management
- 1Plant resistant hybrids
- 2Apply fungicide where disease pressure is high
- 3Rotate crops
- 4Manage crop residue
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