Answer: Frost damage is the usual culprit but sunscald or sometimes a fungal disease can cause the same symptoms. Any damaged part can invite insects and disease pathogens so the mites you found were not the cause of the splitting but a secondary problem. Mangoes usually heal over any damage or at least exude sap to flood the area. If there is no sap, the tissues near the split are probably dead. I can't really diagnose the problem without seeing it or even offer any suggestions. With any luck the damage will eventually heal over. If not, you may need to replace your mango with a healthy specimen.
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