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The control of black pod, canker and seedling blight of cocoa, caused by Phytophthora palmivora, with potassium phosphonate

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Abstract

Trunk injected potassium phosphonate (8 or 16 g a.i. per tree every 6 months) controls black pod and stem canker of cocoa: Foliar sprays of potassium phosphonate (20 g a.i. per tree every 6 months) or Ridomil Plus 72WP (0.72 g a.i. per tree every 6 weeks during the wet season) do not control black pod. Trunk injection is less weather dependent than foliar sprays, and is a more effective application method for mature trees in the cocoa growing areas of Papua New Guinea. Single Ridomil Plus 72WP (0.8%) or potassium phosphonate (4%) sprays control artificially inoculated seedling blight more effectively than either a lower rate of potassium phosphonate (0.5%) spray or a soil drench of potassium phosphonate (1%).

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References

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Authors and Affiliations

  1. Cocoa Black Pod Research Trust of Papua New Guinea, P.O. Box 711, Madang, Papua New Guinea

    R. D. Anderson

  2. School of Botany, University of Melbourne, 3052, Parkville, Victoria

    D. I. Guest

Authors
  1. R. D. Anderson
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  2. D. I. Guest
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Anderson, R.D., Guest, D.I. The control of black pod, canker and seedling blight of cocoa, caused by Phytophthora palmivora, with potassium phosphonate. Australasian Plant Pathology 19, 127–129 (1990). https://doi.org/10.1071/APP9900127

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  • DOI: https://doi.org/10.1071/APP9900127

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