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Production · Protection · Nutrients · Water
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Symptoms

  • The cankers appear either on the main trunk, jorquettes or fan branches.
  • The earliest symptom is the appearance of a greyish brown water soaked lesion on the outer bark.
  • A reddish brown liquid oozes out from these lesions, which later dries up to form rusty deposits.
  • The tissues beneath the outer lesion show reddish brown discoloration due to rotting.

Management

  • It can be controlled in the initial stages by the excision of diseased bark followed by wound dressing with Bordeaux mixture or copper oxychloride paste.
  • Wilted branches should be cut and removed.

Image Source:

Brown water soaked spotsDried rusty appearanceRotten bark
Source

Written and published by Tamil Nadu Agricultural University, and reproduced here unchanged. The original is at https://agritech.tnau.ac.in/crop_protection/cocoa_3.html.

Images, PDFs and interactive tools on the original page were not captured — follow the source link for those.