Gnats often infest trash cans, rotten fruit, and other moist places where decomposing organic matter exists. They can also be found near sinks, drains, and toilets.

Where do gnats make their nests?

Fungus gnat development sites are usually associated with plants and moist soil where they feed on damp, organic material and live in piles of plant debris, compost piles and mulch around the house.

How do gnats appear out of nowhere?

Good breeding spots and ample food supplies appeal to the pests. Rotting leaves, damp mulch in flowerbeds, and light attract gnats, too. Open doors and damaged screens near landscaping or brightly lit signs above hotel and grocery store entrances make it easy for the flies to move indoors.