Black spot: Alternaria sp.

Symptoms

• In older plants, leaves, petioles, and stems small, brown to black circular to slightly elongated spots appear. Sometimes the spots join together.
• It causes damage to cabbage heads and cauliflower curds after maturity and during seed production stage.

Management

• First foliar spraying with Tridemorph 0.1% followed by spraying with Mancozeb 0.25% a month interval.