Symptom

• The first symptom usually appears as elongated lesions along the edge of the leaf segment.
• Non-marginal lesions appear as small, pin-point chlorotic spots which shows develop into a necrotic center surrounded by a diffuse chlorotic border.
• Coalescence of spots is common. linear dark lesions develop on the petiole, sometimes girdling the latter and killing the leaf.

Management

• Seed treatment with Captan 4g/kg
• Spraying at 10 days interval with Copper oxychloride or Mancozeb.

Image Source:

www.nysipm.cornell.edu/factsheets/vegetables/misc/clb.pdf