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Infection starts about a month after sowing.
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Small chlorotic spots appear on leaflets, with time they enlarge and turn brown to black and assume sub circular shape on upper leaf surface.
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On lower surface of leaves light brown colouration is seen.
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Lesions also appear on petioles, stems, stipules.
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In severe cases several lesions coalesce and result in premature senescence.
Management
Spray any one of the following:
- Carbendazim 500 g/ha
- Mancozeb 1000 g/ha
- Chlorothalonil 1000 g/ha
If necessary give the second round 15 days later. Combined infection of rust and Leaf spot
Spray any one of the following:
- Spray 10% Calotropis leaf extract
- Spray Carbendazim 250 g + Mancozeb 1000g/ha
- Chlorothalonil 1000g/ha. If necessary give the 171 second round 15 days later.
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| Healthy Leaf |
Infected Leaf |
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