This is what I would refer to as the go to ultimate tactical warfare loadout for combating the dreaded fungas gnats.
mesquito dunks to kill larvae, yellow stickies to slow the adult population
a big bag of floor dry aka diaomataceous earth to cover the surface of your soil..you'll have to re-apply D.E after watering...you can also look for a pest strip, same shit flea collars were made of, can't remember the name...kinda contentious amongst organic growing crowds but they help take care of the little bastards too at the air level.
You can also use another biological warefare like Stratiolaelaps scimitus..but if used, refrain from applying D.E.
I swear Fungas gnats were put on earth for one reason.....to be my life long enemy..
I hate them damn gnats..
But they are a common pest in organic gardens.
I talk nice to my plants...while at the sametime I talkshit and give death threats to fungas gnats...lol