Little Black Flies

Yellow sticky traps will help catch the ones airborne. Increase air flow on the soil to dry the top inch. Perlite can also be used if drying the soil don't work. Place a inch thick layer of perlite on top of the soil. Predator pest can be bought to help fight off your infestation as well. They need wet soil, so if you can remove their breeding ground by letting the top dry out or by placing a inch thick layer of perlite. Then it will stop the breeding. Then added airflow with yellow sticky traps will help catch air borne pest and if all else fails buying predator bugs to eat them Goodluck