Sudden gnat swarms are almost always caused by a new moisture source or decaying organic matter. These tiny pests breed rapidly, meaning a few can turn into an infestation in just a few days.
Look for adult fungus gnats resting on plants, soil, windows, or walls to identify the source of your infestation. If you do have an infestation, you can use yellow sticky traps to catch adults. If that does not work, place chunks of raw potato in pots with the non-peeled side facing down.
Gnats are most active during the warmer months, specifically from late spring to early fall (peaking in May through September). They thrive in warm, humid weather and are especially prevalent following periods of heavy rain or drought, as standing water and wet soil create the ideal breeding grounds.
To permanently get rid of gnats, you must target their breeding grounds. First, locate and eliminate the source—usually overwatered houseplants, stagnant water, or rotting produce. Then, set traps to kill remaining adults and use larvicides to stop the next generation from hatching.
To get rid of gnats when you cannot find the source, set up apple cider vinegar (ACV) traps with dish soap to catch adults and treat all household drains with boiling water or a baking soda/vinegar mix to destroy breeding grounds. Use yellow sticky traps near houseplants, which are common, hidden breeding sources.
To eliminate 100% of a gnat infestation, you must break their breeding cycle by treating the adults and eliminating their source. Use a DIY apple cider vinegar trap for adults and fix the source: let your plant soil dry out or treat it with a hydrogen peroxide mix.
Gnats are highly repelled by strong, pungent botanical scents. Their absolute least favorite smells include:
Gnats lay their eggs in damp, moist environments containing organic matter. Depending on the species, the specific location varies:
Fast Ways to Get Rid of Gnats
Adult fungus gnats live for about 7 to 10 days. However, the entire life cycle (egg, larva, pupa, and adult) takes about 3 to 4 weeks. Because they reproduce quickly, multiple overlapping generations can cause an infestation to linger indoors.
Fungus gnats are found throughout the United States and on other continents. They are usually found where there are plants and moisture. These pests are most noticed during late fall and winter, mostly due to plants being brought indoors, out of cold weather.
At night, gnats seek out quiet, sheltered, and humid environments. Rather than sleeping like humans, they enter a state of rest (torpor) on the undersides of leaves, in dense vegetation, or resting directly on the soil of houseplants. Indoors, they often hide in sink drains, dark corners, or near window frames.
Suddenly swarming gnats usually mean a new, localized breeding ground has appeared. Because they reproduce extremely quickly, dozens can turn into a cloud in just a few days.
Yes, certain types of gnats—commonly known as drain flies or sewer gnats—live and breed in drains. They thrive in the dark, moist environments where organic slime, hair, and decomposing food particles build up inside pipes.
Keeping gnats or flies out of your home is an ongoing process, and Orkin Pros are trained to address any current gnat infestation, as well as implement solutions to help prevent future issues. As with most pest control and management, it's best to rely on a trained Orkin Pro to help get rid of a gnat infestation.
To permanently get rid of gnats, you must attack them at their source: eliminate the breeding grounds, break their reproductive cycle, and trap the remaining adults. The most effective methods target their specific habitats—houseplants and drains—using simple household solutions and targeted treatments.
In the Bible, gnats appear in both the Old and New Testaments as symbols of God's supreme power, human frailty, and religious hypocrisy.
A sudden housefly infestation often happens after bringing home food, missing a trash day, or dealing with plumbing problems. Flies get in through small gaps around windows, doors, or vents. Once inside, they're drawn to moisture, rotting food, dirty drains, pet waste, and even damp houseplants.
Gnats lay eggs in just about any moist area, like the pea trap in a drain or caulking in need of repair or damp floor behind the toilet (from condensation on the toilet's tank).
Gnats don't actually build "nests." Instead, they breed and lay hundreds of eggs in moist organic matter or stagnant water. To find their source, track down the specific type of gnat based on where they swarm.
Gnats reproduce incredibly fast. A single female can lay 100100100 to 300300300 eggs in her short lifetime. Because the entire lifecycle—from egg to adult—takes only 17 to 28 days depending on room temperature, a small number of gnats can turn into a massive indoor swarm within a few weeks.
Yes, dryer sheets can repel certain gnats, but they are not a permanent or foolproof solution.
Adult gnats live for about 7 to 10 days. During this short time, a female can lay up to 300 eggs in damp organic matter or soil. The entire life cycle from egg to adult takes about 3 to 4 weeks.
Yes, anecdotal evidence suggests Vicks VapoRub can help deter black flies in the immediate area where it is applied. Its active ingredients—menthol, camphor, and eucalyptus—produce strong scents that confuse and repel many insects. However, its effectiveness is highly localized, temporary, and less reliable than standard commercial repellents.