Gnats love to live in rotten organic matter like soil.
I’m organic and my old room was near a window I had a hella a time with them trying everything d.e,mosquito dunks,
neem oil ect ect ect
in the end I tried nematodes and in days they had munched them up
There really gentle and do no harm at all they only eat the gnats larva putting a end to thier life cycle.
Put some yellow sticky traps up the adults are attracted to the colour
Info below and seller of nematodes
What are Fungus Flies? The Fungus Fly, also known as the Sciarid Fly, can cause severe damage to plants. These tiny flies will lay eggs in compost or soil, from which larvae will develop. The larvae feed on young plants and seedlings at propagation. Fungus Fly are also a common pest in...
dragonfli.co.uk