Another trick is to aim a gentle breeze from a fan over your growing area. The adults are not strong fliers, and if constantly blown away from the plants they will not be able to lay eggs. Soon the remaining larvae will mature and the population will entirely blow away. People who grow cactus from seed indoors under lights use this trick.
And one day at the office I saw a can of tick spray intended for dogs. I asked whether anybody there had ticks. I was informed "everybody" knew tick spray on the soil would kill the little gnats flying around house plants.
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