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Horticultural crops :: Vegetables:: Chilli

Bacterial leaf spot: Xanthomonas campestris pv. vesicatoria

Symptoms

  • The leaves exhibit small circular or irregular, dark brown or black greasy spots. As the spots enlarge in size, the centre becomes lighter Surrounded by a dark band of tissue.
  • The spot coalesce to form irregular lesions. Severely affected leaves become chlorotic and fall off.
  • Petioles and stems are also affected. Stem infection leads to formation of cankerous growth and wilting of branches.
  • On the fruits round, raised water soaked spots with a pale yellow border and produced.
  • The spots turn brown developing a depression in the centre wherein shining droplets of Bacterial cozen may be observed.   

Management

  • Seed treatment with 0.1% mercuric chloride solution for 2 to 5 minutes is effective.
  • Seedlings may be sprayed with Bordeaux mixture 1. Per cent or copper oxychloride 0.25%.
  • Spraying with streptomycin should not be done after fruits begin to form.
  • Field sanitation is important. Also seeds must be obtained from disease free plants.

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