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Causal Agent: 

Fungus (Cercospora zea-maydis)

Characteristic Symptoms:
 
Lesions begin as small, necrotic spot with or without chlorotic halo.
   
Elongated necrotic spots may grow parallel to the veins giving a rectangular appearance with straight edges.
     
Conditions for Disease Development:
 
The disease is favoured by warm temperature and high humidity.
   
Extended leaf wetness favours leaf infection.
   
Management and Control:
 
Use of resistant varieties, if available.
   
Crop rotate with non-host crops to reduce corn residues and disease inoculum.
   
Bury plant residues below the surface to  reduce primary infection levels.
   
Apply fungicides such as pyraclostrobin+dimetomorph (e.g. Cabrio®), propiconazole(e.g. Bumper®, Tranzole ®), tebuconazole(Folicur®).
 
   

References

Gray Leaf Spot of Corn. Crop Focus. Pioneer Hybrid. 2010.

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

To view other diseases,  click here.

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