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Black fly problem

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rowenj | 10:38 Tue 30th Oct 2012 | Gardening
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I have a potted cactus that i have been keeping on the windowsil. Now it's plagued by these small black fly, they seem to live in the soil and lay their eggs there and are a nusance. They fly all over the room, I often see one or two on my monitor screen.
My question is how do I get rid of them once and for all?
So far I have resorted to fly spray but this does not kill the eggs/lavae or some just survive.
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Repot the plant and dispose of the old medium. Check the plant thoroughly befor replanting.

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