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Fungus Gnats

Active Seasons

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Illustration representing the summer season
Illustration representing the winter season
Illustration representing the fall season

Appearance and Size Facts

  • Most species of fungus gnats are black in color
  • Identifying characteristics are long legs and long, thin wings
  • Some fungus gnats, such as dark winged fungus gnats, may appear to have black colored bodies and smoky or black colored wings
  • Size: These small flies range from 1/16 to 1/4 inch in length
  • Attracted to sunlight and people's colognes or perfumes

Behavior and Habitat of Fungus Gnats

Fungus gnats are very small and can be an extreme nuisance. They are attracted to sunlight and also people's colognes or perfumes. Fungus gnats prefer to lay their eggs in moist potting soil, which is why buildings containing potted plants or atriums may often have problems. Soon after the eggs are laid, the larvae emerge to feed on fungus growing in the damp potting soil. After feeding for a short period, the larvae pupate. A few days after pupating, the adult fungus gnats emerge to start the process again. Fungus gnats may breed anywhere that suitable molds or fungi might grow. A fungus gnat infestation in a home could mean a moisture problem is present. Although fungus grows in areas such as moist wood (the result of leaks or poor insulation) and poorly ventilated crawlspaces and attics, most infestations are associated with moist potting soil. Look for adult fungus gnats in areas where moisture problems have been observed or are suspected. Fungus gnat eggs and larvae are usually not on the exposed surface of soil and are too small to see without proper magnification.

Image of a magnifying glass

Signs of Infestation of Fungus Gnats

Fungus gnat larvae feed on highly organic soils and can damage the roots of bedding plants and house plants, such as African violets, carnations, poinsettias, and other foliage plants.

An illustration representing a warning sign for bug infestation

Tips for Prevention of Fungus Gnats

Allow the growing medium to dry between watering, especially the top 1 to 2 inches. The dry-growing medium will decrease survival of any eggs laid and/or larvae that hatch from the eggs, as well as reduce the attractiveness of the growing medium to egg-laying adult females. Letting potting medium dry between watering will also cause the fungus in the soil to subside, and will also help to reduce root-borne fungal diseases that may attack the plant.

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Fungus Gnat Gallery

Photograph of fungus gnat
Photograph of fungus gnat number 2

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