Causal Agent:
Fungus (Physoderma maydis)
| Characteristic Symptoms: | |
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Symptoms develop on leaf blades and consist of small chlorotic spots, arranged as alternate bands of diseased and healthy tissues. |
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Spots on the mid-ribs are circular and dark brown. |
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Nodes and internodes also show brown lesions. |
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In severe infections, lesions may coalesce which may induce stalk rotting and lodging. |
| Conditions for Disease Development: | |
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The disease occurs in areas of abundant rainfall and high mean temperatures. |
| Management and Control: | |
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Use of resistant varieties, if available.
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Crop rotate with non-host to reduce disease inoculum. |
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Till properly to encourage breakdown of crop residues.
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References
https://www.pioneer.com/home/site/mobile/grow/corn/physoderma-brown-spot/
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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