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Causal Agent: 

Fungus (Exerohilum tursicum syn Hemninthosporium tursicum)

Characteristic Symptoms:
 
Long, gray-green and elliptical or cigar-shaped lesions develop first on older lower leaves.
   
Pale gray to tan lesions will be formed as the disease progresses.
   
Husks can be infected with the disease but not on ears.
   
Lesions on resistant hybrids have a yellow margin.
   
NCLB pathogen  overwinters on leaves, husks, and other plant parts in debris.
   
Conditions for Disease Development:
 
Moderate temperatures, heavy dews, and frequent showers are favorable for the disease. High losses will occur with infection before silking.
   
In wet weather, black spores are produced on the lesions that are wind-blown over long distances. Secondary spread is common within and between fields.
   
Management and Control:
 
Use resistant varieties, if available.
   
Crop rotate with non-host to reduce corn residues and disease inoculum.
   
Apply fungicides such as pyraclostrobin+dimetomorph (e.g. Cabrio®), azoxystrobin (e.g. Amistar®) or propiconazole (e.g. Bumper®, Tranzole ®).
 
   

References

https://www.pioneer.com/home/site/us/agronomy/crop-management/corn-insec...

The CIMMYT Maize Program. 2003. Maize Diseases: A Guide for Field Identification. 4th edition. Mexico, D.F.: International Maize and Wheat Improvement Center (CIMMYT).

Wise, K. 2015. Fungicide efficacy for control of corn diseases. Purdue Extension Publication BP-160-W. Purdue University, West Lafayette, Indiana.

To view other diseases,  click here.

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