Dept of Agriculture Development 
SFAC KeralaThe infected tissue turns pale green-yellow and then turns brown and dies.
Affected areas are usually wedge or V shaped.
These area enlarge as the disease progresses and severely affected leaves may drop off.
The veins in infected leaves stems and roots sometimes become black.
The heads of the infected plants remains small and its quality is reduced making it unfit for marketing.
Use black rot tolerant varieties
Treat seeds with Pseudomonas 20g/litre of water/kg of seed
Affected plants should be removed and destroyed.
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