Causal Agent:
Oomycete (Pseudoperonospora cubensis)
| Characteristic Symptoms: | |
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Small, angular and yellowish to pale green lesions that are demarcated by leaf veins are the typical symptoms of downy mildew. |
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Advanced lesions appear as brown necrotic lesions with mass of black spores on the underside of the leaves. |
| Conditions for Disease Development | |
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Cool nights with long dew periods favors disease development. |
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Spores on infected melon leaves can be dispersed by wind.
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| Management and Control: | |
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Use of resistant varieties, if available.
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Maintain good field sanitation (e.g. remove and burn infected plants/plant parts as soon as initial symptoms are observed). |
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Spray with fungicides such as metalaxyl+mancozeb (e.g. Ridomil®), dimethomorph+mancozeb (e.g. Acrobat®), propineb (e.g. Antracol®) or maneb(e.g. Maneb®).
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References:
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