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Characteristic Symptoms:
 
Symptoms of southern corn leaf blight depends on what race of the pathogen is present.
   
Race 0 is common in sub-tropical and tropical areas.
   
Spots of Race O  are tan in color with brown borders.
   
Lesions begin as small, diamond-shaped lesions and elongate within the veins to become larger and rectangular.
   
Race O's lesions remain within the leaves of the maize plant.
   
Lesion size ranges from 2 to 6 millimeters wide and 3 to 22 millimeters long.
   
Conditions for Disease Development:
 
The fungus overwinters in corn debris and on seed.
   
Wind and splashing water spread the spores rapidly in the field under ideal conditions.
   
SCLB disease is prevalent in hot and humid corn growing areas.
   
B. polaris requires slightly higher temperatures for infection than H. turcicum
   
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://en.wikipedia.org/wiki/Southern_corn_leaf_blight
The CIMMYT Maize Program. 2003. Maize Diseases: A Guide for Field Identification. 4th edition. Mexico, D.F.: International Maize and Wheat Improvement Center (CIMMYT).
   

 

 

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