I'm not a cocoa expert but I think you may be looking at black pod disease which is caused by any of several different species of Phytophthora fungi. The following links may be helpful.
This one is mainly about the disease and pathogen https://www.ctahr.hawaii.edu/oc/freepubs/pdf/PD-108.pdf
and this one actually has some decently sourced disease management suggestions, even if it is wikipedia. https://en.wikipedia.org/wiki/Black_pod_disease
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