Controlling House Flys & House Flies

Flies are among the most common and annoying home pests. We've put together a guide to the most common Flies that invade your home. Learn how they end up there and what you can do about them.

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  • Gray tone, up to one-half-inch long
  • More common indoors during warmer months, but can survive up to 50 days indoors if food is present
  • Carries many disease-causing germs
  • Tends to rest in room corners or on thin objects, such as blinds or electrical cords

Prevention tip: Maintain a clean house. Dispose of pet waste properly. Seal garbage cans tightly. Install screens over windows and doors and be aware of other common insect entry points. (url link:

Cluster Fly

  • Large, dark gray, slow-moving Flies. These are the Flies that bump into you in winter
  • Tend to cluster along window ledges and are more prevalent on the upper floors of a building
  • Are Earthworm parasites; commonly found where healthy earthworm populations exist, such as in a well-groomed lawn
  • Don’t reproduce or feed during winter

Prevention tipApply an insecticide perimeter treatment to exterior walls, especially warmer southern and western walls. Treat upper floors, since Flies tend to gather there.


  • Fairly large Flies in shades of metallic green, blue or black
  • More common during warm months, although sometimes adults overwinter inside walls and emerge into warm living spaces
  • A scavenger Fly associated with pet waste, manure or dead animals

Prevention tip: Keep garbage cans tightly sealed; dispose of pet waste properly.

Fruit Fly or Vinegar Fly

  • One of the smallest Flies found indoors, around one-eighth of an inch
  • Typically enter homes during fall harvest season, when outdoor populations are high due to ripening fruits

Prevention tip: Remove overripe fruits and vegetables. Rinse recycling materials to eliminate bits of soda or beer, which can ferment and provide breeding areas for Fruit Flies.

Fungus Gnat

Prevention tip: Reduce watering frequency for houseplants and allow soil to dry between waterings. Don't let plants sit in water; don't allow water to sit in drainage dishes. For severe outbreaks, use Dual Action Rose & Flower Insect Killer.

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