University of Florida

Fungus Gnats

Fungus gnats are often a problem in households with potted plants. The larvae of these small winged insects feed on decaying plant materials and fungus growing in the soil.

Fungus gnats are about an eighth of an inch long and look like a cross between a fruit fly and a mosquito. Adults are attracted to light and are often noticed at windows. And they can be quite annoying when they fly in people's faces.

Fungus gnats are drawn to plants that are overwatered, so one way to control these flies is to let the soil dry out between waterings, though you don't want to harm your plants in the process.

Another strategy is to drench the soil with an approved insecticide. Give your houseplants proper care, and you'll help keep these pesky insects in check.

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Fungus gnat photo
University of Nebraska
Dept. of Entomology

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