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Causal Agent: 

Fungus (Peronosclerospora philippinensis)

Characteristic Symptoms:
 
Chlorotic stripes or overall yellowing on the first true leaves is the initial symptom of the disease.
   
Under favorable condition, white downy growth of conidia and conidophores on the upper and lower leaf surface will develop.
   
Tassels may be malformed and produce less pollen.
   
Downy mildew fungus can invade the stem as well as the shoot apex.
   
Conditions for Disease Development:
 
The disease is most prevalent in warm and humid regions.
   
Downy mildew frequently occurs in areas of fields subject to flooding.
   
Seedlings are more susceptible than adult plants.
   
Spore production requires high humidity, with at least a thin film of water on the infected leaf surface.
   
Management and Control:
 
Use resistant varieties, if available.
   
Use fungicide-coated seeds.
   
Avoid areas prone to flooding.
   
Provide adequate drainage for surface water.
   
Maintain good field sanitation (e.g. remove and burn infected plants/plant parts as soon as initial symptoms are observed).
   
Spray with fungicides such as  metalaxyl+mancozeb (e.g. Ridomil®), dimethomorph+mancozeb (e.g. Acrobat®), propineb (e.g. Antracol®) or maneb(e.g. Maneb®).
 
   

References

https://www.pioneer.com/home/site/us/agronomy/crop-management/corn-insect-disease/downy-mildew/

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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