Gray Leaf Spot-Cercospora zeae-maydis
Cercospora zeae-maydis is the fungus that causes the disease. Early symptoms are yellow to tan lesions with a faint watery halo. As the lesion progresses it turns brown and rectangular in shape that exist between the distances of the veins. When fully developed the lesion can be 3 to 4 inches long and a 1/6 to 1/8 inch wide. The fungus can overwinter on corn debris left on the soil surface. Spores develop when it starts getting warm and the humidity started to rise in late spring. The spores can be transmitted by both wind and rain. In some cases gray leaf spot can limit yield up to 5 to 40 bushels of corn per acre.
Management of Gray Leaf Spot
1.Select corn hybrid with at least moderate resistance to gray leaf spot.
2.Crop rotation and tillage is an effective method to control the fungus.
3.Fungicides may be needed to prevent significant loss when plants are infected early and environmental conditions favor disease. Since economic return on foliar fungicide investment is still poorly understood, growers who apply fungicide are urged to leave non-sprayed strips in their fields for comparison of yield and disease severity.
For more information see they following video: www.youtube.com/watch?v=KlJZ94RPC4I
Gray Leaf Spot-Cercospora zeae-maydis
Cercospora zeae-maydis is the fungus that causes the disease. Early symptoms are yellow to tan lesions with a faint watery halo. As the lesion progresses it turns brown and rectangular in shape that exist between the distances of the veins. When fully developed the lesion can be 3 to 4 inches long and a 1/6 to 1/8 inch wide. The fungus can overwinter on corn debris left on the soil surface. Spores develop when it starts getting warm and the humidity started to rise in late spring. The spores can be transmitted by both wind and rain. In some cases gray leaf spot can limit yield up to 5 to 40 bushels of corn per acre.
Management of Gray Leaf Spot
1.Select corn hybrid with at least moderate resistance to gray leaf spot.
2.Crop rotation and tillage is an effective method to control the fungus.
3.Fungicides may be needed to prevent significant loss when plants are infected early and environmental conditions favor disease. Since economic return on foliar fungicide investment is still poorly understood, growers who apply fungicide are urged to leave non-sprayed strips in their fields for comparison of yield and disease severity.
For more information see they following video: www.youtube.com/watch?v=KlJZ94RPC4I