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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.
Dept of Agriculture Development 
SFAC Kerala