Fungus Gnats- Pest Fact

Common name

Darkwinged fungus and fungus gnats

Scientific name





Size (Adults)

1 – 13.3mm (whole body length)

Body shape


General body colour

Usually black or brown/yelowish


  • Adults typically found on or near larval food  materials = fungi on soil/ moist decaying matter
  • Other food source: animal excrement, decaying plant material, rotting wood
  • Adults of most species are attracted to lights



1. Inspection
  • Carefully examine all susceptible foods to determine all sources of infestation
  • Overwatered potted plants and atriums is a source of gnat infestations.
  • Inspect areas with water leaks,  peeling paint (where fungi may grow)

2. Source removal and mechanical control
  • Remove live plants and replaced with artificial plants (in offices and internal areas)
  • Add fans over moist surfaces
  • Removal of overwatered plants

3. Biological/ chemical control
  • Misting of Bacillus thuringiensis israelensis (Bti) at external areas infested with fungus gnats
  • BTI targets various of species of fungus gnats as well as larvae of mosquitoes
  • Use of ILTs (Insect Light Traps) for internal control

ORIGIN Exterminators is the first pest management company in the world to be awarded ISO 14001 EMS certification