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Fungus Gnat Identification and Control in Utah

Correct identification is an important first step in pest control.


Fungus gnats are smaller, dark, delicate-looking flies similar in appearance to mosquitos. Their wings are light gray to clear in color, long slender legs and have segmented antennae.

Fungus gnats usually originate from soil in potted house plants and can develop in soil or mulch outside of buildings. Eggs and larvae nest in soil and moist organic material.

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Where do they lay their eggs
Where do they lay their eggs

Eggs and larvae nest in soil and moist organic material.


Sciaridae and Fungivoridae




Yes, they are attracted to light

Thorn Pest Services Tips for keeping fungus gnats away

How To Prevent Fungus Gnats From Entering Your Home
Pest control experts
  • You can prevent fungus gnats from entering your home by making sure your home or building is well sealed, especially around windows and doors. Fungus gnats are very attracted to light and will try to enter buildings if lights are on.

  • If flies are coming in from outside, consider changing exterior lighting to sodium vapor lighting.

How To Get Rid Of Flies Around Your Home
Pest control experts
  • Locate where they could be breeding (remember soil in potted plants) and remove it.

  • Do not overwater your house plants and let the soil dry out between watering.

  • Keep exterior doors closed, install screen doors, or install automatic door closers.

  • You can also use Bacullus thuringiensis, subs. Israelensis-based insecticides (e.g Gnatrol) on soil of affected potted house plants.

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Proper pest management starts with a detailed inspection and assessment from an expert pest professional before treatment. Thorn Pest Solutions uses a three-step process rooted in science to eliminate pests with long-term results.

Assess Situation

First, we identify the root problem(s) with a site assessment. Pests are almost always an indicator of an environmental condition. This will determine the best actions to provide short and your long-term results against pests.

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Next, we develop a plan to fix the problems we discovered. This includes solving current pest issues, eliminating conducive conditions, and monitoring for future pest activity. Good pest management starts with a good plan.

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Lastly, we implement the solutions we developed including inspection, monitoring, and preventing future pest infestations. Good pest control requires a good offense and not just defense. Prevention is key.

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