Problem with fungus gnats
Fungus gnats develop when they have decaying organic matter to feed on. Usually it's an indication that the soil is being kept too moist, so try cutting back on watering. The sticky traps that you mention can help keep the problem under control, but as you note, they're not a quick solution. There is an insecticide called Gnatrol which is drenched into the soil to kill the fungus gnat larvae.
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