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  • Fungus Gnat Flies

    Fungus Gnat
  • Fungus Gnat
  • Fungus Gnat
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Elimination

Firewood and indoor plants are the two main sources of infestation.

We must therefore pay particular attention to the wood as soon as we enter it in the fall, since it can shelter various unwanted insects housed inside or in cracks.

As for indoor plants, their soil can provide an environment conducive to the reproduction of certain insects. To limit the risk of proliferation, it is recommended to let the soil dry completely between waterings. Excess water promotes the decomposition of roots, creating an ideal wetland for laying eggs of sciarid. Consult a garden center to obtain advice or suitable and approved products for the treatment of ornamental plants.

Actions

  • Cut back on plant watering
  • Put clue traps in plants to catch flies
  • Consult a garden center as needed

Prevention

  • Avoid overwatering plants
  • Apply diatomaceous earth–based insecticide dust when stacking firewood indoors

Description and development

Members of the fungus gnat family (Sciaridae ) are holometabolous insects (having four very different life stages) in the Diptera order. The adult measures less than 5 mm and is gray or black. Fungus gnats are distinctive in that their eyes meet above the base of the antennae. They can also be recognized by the pattern of the veins in the wings.
Fungus gnats have four distinct stages in their life cycle: egg, larva, pupa, and adult. The larva feeds on fungi, decomposing plants, or plant roots. The female chooses where she lays her eggs based on the availability of food sources for the larvae. House plants and firewood are the most common sources of fungus gnat infestations in homes.

Habits

The adults are the main problem indoors. Since they are attracted to light, they are usually found on window frames. Live fungus gnats keep their wings folded on the body, whereas dead fungus gnats have their wings spread. They are generally quite numerous.

Tips

An additional tip: Avoid watering house plants too much—that encourages fungus gnats!

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