The easiest control for them is to allow the soil to dry out completely between waterings, which may actually be the best thing for the plants anyhow. The second option would be to cover the soil in these pots with some material that prevents the flies from getting to or from the soil, such as a thick layer of spagnum moss or some screening. The third option would be to use an insecticide such Talstar P. Talstar P is a concentrated liquid insecticide that is diluted with water and then poured onto the soil and sprayed onto the plant itself. We recommend starting with letting the soil dry out between watering as this offers the fastest control in most cases.
Talstar: http://www.domyownpestcontrol.com/talstar-talstar-one-p-97.html
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