Dept of Agriculture Development 
SFAC KeralaSmall, circular, slightly sunken, dark brown spots are the initial symptoms of black rot.
spots enlarge and appear greenish black to black when wet, and grayish black when dry.
Within the spots small black fungal bristles are seen.
The rot usually remains firm and shallow
If secondary fungi or bacteria invade the tissue this blackened area may extend to the center of the root.
Tissues near the discolored area have a bitter taste.
Eventually the entire root may rot
Roots may appear healthy at harvest but rot during transit in storage or in the market
Follow crop rotation.
Disinfect seedbeds.
Propagate plants from healthy stem cuttings.
Cure seeds immediately after harvest.
Do not wash and package roots showing symptoms of black rot.
Fumigate storage structures.
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