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It can do but it needs to be in a form that emits scent to the flies. One good way is as follows: Cut a small piece of sponge into a square. Place on a saucer or other small dish. Pour 1 to 1.5 teaspoons of lavender oil onto the sponge, then pour 2 tablespoons of boiling water over it. This will release the scent and deter the flies. To maintain this deterrence, pour 2 tablespoons of boiling water on the sponge daily, then add more lavender oil twice weekly.
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