Alternaria Leaf spot in Cauliflower and Cabbage:-
Symptoms:-
- Small dark yellow spot appear on the leaf surface.
- Later on the spots enlarge to circulars areas with bluish concentric rings.
- In severe cases, the entire plant defoliates.
- Violet to dark blackish-brown spots develop on infected curd, stem and pods.
Control:-
- Use certified seeds.
- Give hot water treatment to seed at 50OC for 30 Minutes.
- Spray the crop with Mancozeb 3 gm per litre of water or Copper oxychloride 3 gm per litre of water at 10-15 days intervals, first spray be given on the appearance of symptoms.
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