How to check purple blutch and damping of Onion ?

damping onion Purple
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How to check purple blutch and damping of Onion ?

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Answer- Spray the crop with Bavistin @ 1g/litre or Indofil M-45 @ 3g/litre or copper oxychloride @ 3 g/litre of water when the disease appears and continue the spray thrice with an interval of 10-15 days. Treat the seeds with captan or Thiram @ 3g/kg seeds before nursery sowing.

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