Chilli Bacterial leaf spot: Xanthomonas campestris pv. vesicatoria
Symptom:
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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.
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The spot coalesces to form irregular lesions. Severely affected leaves become chlorotic and fall off.
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Petioles and stems are also affected. Stem infection leads to the formation of cankerous growth and wilting of branches.
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On the fruits round, raised water soaked spots with a pale yellow border and produced.
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The spots turn brown developing a depression in the centre wherein shining droplets of Bacterial cozen may be observed.
Management:
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Seed treatment with 0.1% mercuric chloride solution for 2 to 5 minutes is effective.
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Seedlings may be sprayed with Bordeaux mixture 1. Per cent or copper oxychloride 0.25%.
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Spraying with streptomycin should not be done after fruits begin to form.
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Field sanitation is important. Also, seeds must be obtained from disease free plants.
Source-
- TamilNadu Agritech Portal
