Maggots and rotting inside my sapota fruit near harvest (chiku)

Maggots and rotting inside ripening sapota usually mean fruit fly, and in some areas a seed or fruit borer can also attack the fruit. Cutting an affected fruit will show whether it is the soft legless maggots of fruit fly or a borer caterpillar, which matters because the control differs, so please confirm with your KVK. For fruit fly the proven approach is sanitation plus trapping: collect and destroy all fallen and infested fruit daily by deep burying or sealing in a sun-exposed bag, and hang traps with a male lure such as methyl eugenol at the number per acre your KVK advises. Harvest at the correct maturity and do not let fruit over-ripen on the tree. For borer, sanitation of affected fruit and well-timed sprays at the right stage are used. Bagging fruit where practical keeps both pests off. If a spray or bait is needed, use the spot-patch protein bait for fruit fly to keep residue low, and for any cover spray follow the label, the pre-harvest interval, residue and MRL limits, and rotate modes of action. Get the pest confirmed first so the timing and method match.