From one of the references above Banana rust thrips could be the cause of the spots and splitting of the peel. These are controllable with insecticide and bagging.
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Thrips – Banana rust thrips (C. signipennis), as its name suggests, stains the peel, causing it to split and exposes the flesh which then begins to rot. Insecticidal dust (Diazinon) or a spraying of Dieldrin can control thrips, which pupate in the soil. Additional insecticides combined with polyethylene bagging are also used to control thrips on commercial farms.
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