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Horticultural crops :: Plantation :: Cocoa
Stem Canker: Phytophthora palmivora

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.
Brown water soaked spots Dried rusty appearance Rotten bark

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:

http://www.dropdata.org/cocoa/cocoa_prob.htm

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