Fruit flies can keep appearing after a cleanup if eggs and larvae remain in a hidden moist, fermenting source. Catching visible adults does not remove the place the next generation develops.
Search overlooked spots
Check the bottom of recycling bins, sticky bottle necks, under small appliances, damaged produce and forgotten potatoes or onions. Wash surfaces rather than relying only on scented sprays.
Remove the source completely
Discard spoiled items, rinse containers and clean organic residue from drains and trash areas. Keep fresh fruit protected when practical and empty compost containers often.
Monitor improvement
A vinegar trap can catch some adults while you look for the remaining source. If new flies continue appearing, identify the insect again; fungus gnats and drain flies need different control methods.
Frequently asked questions
Can fruit flies come from a neighboring apartment?
They may move through open doors or windows, but indoor breeding sources should still be investigated first.
Related: how to get rid of gnats in kitchen.
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