Fungus gnat lay eggs in moist soil or moist organic debris of plant origin. Some examples of habitat where females lay eggs include piles of leaves, garden and grass debris, compost piles and mulch. It takes about three days before the larval stage hatches from the eggs.

How do you find a nest of gnats?

Gnats may be entering the building from the outside if no planters or atrium areas are serving as breeding sources. Check the plants, soil and organic matter outside near entry points like doors and windows. Look for adult Fungus gnats flying around the plants outside as well.

What is the fastest way to get rid of gnats?

In a small bowl, mix a half cup of warm water plus two tablespoons of apple cider vinegar, a tablespoon of sugar, and about six drops of liquid dish soap. Gnats will be lured in by the sugary mixture, but once they dip in for a drink, the sticky dish soap will trap them.