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fungus gnat


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Identification of Fungus Gnats

Most species are black in color and very small (less than 1/16 inch) in size, although a few species may reach 1/4 inch long.  Key identifying characteristics include long legs and long thin wings.  See the Fungus Gnat image for detailed appearance.


Fungus Gnat

fsgnat.jpg (17050 bytes)

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Fungus Gnat Elimination

Indoor Control      Outdoor Control        Fly Control in Restaurants

Indoor Control

To kill existing fungus gnats indoors, use Pyrethrin space sprays and pheromone traps.  To actually control and/or eliminate fungus gnat infestations in structures, the breeding sites of these flying pests must be addressed.  Understanding the biology of fungus gnats is also of utmost importance if you wish to control the situation.

Locate all possible Fungus gnat breeding sites; these sites must be altered or eliminated.  Because Fungus Gnats feed on fungus growing in moist organic matter and potting soil, the moisture in these areas must be greatly reduced or eliminated, if at all possible.  When potting soil is allowed to dry between water applications, fungi are far less likely to grow.  Without their food (fungus,) the fungus gnats cannot develop and mature into egg-laying adults.

To summarize indoor control, reduce the existing adult Fungus Gnats with the use of Pyrethrin sprays and pheromone traps; eliminate the infestation by locating and eliminating breeding sites.

Outdoor Control

  1. The first step in controlling outdoor Fungus Gnats is to locate the moist soil where fly eggs are being laid.  Rake the mulch and underlying soil, exposing the top layer of soil to sunlight and air flow.  This will dry the soil, killing the fungus which feeds immature flies.

  2. After preparing the soil, use a good surface treatment such as Talstar liquid concentrate, Cyper WP, Demon EC or Cypermethrin EC 4 ounce.  Talstar is best, but Demon EC (or other products containing Cypermethrin) will suffice for smaller jobs.  Mix a medium to weak solution of your pesticide and spray all suspected breeding sites, as well as the immediate surrounding areas.  The treated areas will be perfectly safe for pets and children to re-enter when label instructions are followed and treated areas are allowed to dry.  Repeat the application in 7 to 10 days, for heavier infestations.

Fungus Gnat Biology

These tiny pests belong to the families of flies called Fungivoridae and Sciaridae

Adult Fungus Gnats prefer to lay their eggs in moist potting soil, which is why buildings containing potted plants or atriums.  Soon after the eggs are laid, the larvae emerge to feed on fungus growing in damp potting soil.  After feeding for a short period (little is actually known and been documented on their life cycle,) the larvae pupate.  A few days after pupating, the adult Fungus gnats emerge to continue the cycle and increase the population.

Inspecting for Fungus Gnats

Fungus Gnats are often first noticed flying to or around lights, both indoors and out.  When adult Fungus Gnats are seen, begin inspecting the indoor areas for moisture problems.  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 flies in areas where moisture problems have been observed or are suspected; fungus gnat eggs and larvae are more often not on the exposed surface of soil and are too small to see without good magnification.

Once you have successfully located one source, continue your inspection.  There are usually several breeding sites in a building by the time adult flies have been become a nuisance.  In many cases, Fungus Gnats are invading a building from outdoors.  Finish your inspection by evaluating the soil around the building.  Some flower beds and other landscaped areas are never allowed to dry properly between irrigation cycles.  Sprinkler heads might be located too close together or need to be redirected.  Make sure that these areas are not being watered too often or too much.  Even with good irrigation practices, the soil in landscaped areas often retain moisture long enough to allow fungus to grow, which serves as another food source for fungus gnats.  In these cases, raking the mulch and underlying soil will allow enough air circulation to increase drying times.  Raking helps kill existing fungi, exposing them to light and air.

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Identification of Fungus Gnats   Fungus Gnat Image    Fungus Gnat Elimination

Fungus Gnat Biology    Inspecting for Fungus Gnats    Products for Fly Elimination

fungus gnats.