Take an empty plastic soft drink bottle, cut off the top at the shoulders, turn it around so that the spout is sticking into the bottle, and tape the edges firmly. Fill the bottle a third full of bait, cover the hole with mosquito netting and suspend this from trees or stakes in the garden. Or, just fill a plastic bottle half full of bait, hang it spout downwards and punch a few very small holes in what is now the top.
Fruit fly can fly for about a week before they mate and lay eggs. If you can kill them in this time you'll break the breeding cycle. Bait and traps are very effective and provide the continuous control needed. Their main disadvantage is that they may attract fruit fly into your area before they would normally appear.
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