Cluster Flies

Cluster Flies Identification

What do cluster flies look like?

Cluster flies are often confused with the common house fly; and while they do look similar, there are some differences.  Cluster flies are bigger than house flies, adults can grow to 3/8th to ½ an inch in length. Their bodies are gray, and they may have some darker black markings as well.  Cluster flies are covered in gold-yellow hairs instead of having a metallic appearance like the house fly.

What attracts cluster flies?

Cluster flies are attracted to homes in the late fall in order to find a suitable site to overwinter in.  They will “cluster” together behind walls and in attic spaces.  In the spring when the weather warms, they will exit your home in order to begin feeding and breeding.

Are cluster flies dangerous?

Cluster flies are mainly considered to be nuisance pests; they don’t bite or sting, and aren’t known to spread diseases like filth flies.  Cluster flies may emerge from their hiding spots on warm sunny days and will gathering around windows, door frames, and sky lights.  If these flies are accidentally squished they may leave behind an unpleasant odor and grease spot. Because of this, the best way to eliminate wandering cluster flies is with a vacuum instead of a fly swatter.

Cluster fly control

Cluster flies live in the hard to reach spaces of your home which makes getting rid of an infestation particularly difficult.  The best way to find and get rid of all cluster flies overwintering in your home is to contact a pest control company.  At Pine State Pest Solutions, our experienced pest control technicians will inspect, treat and advise you on how to prevent future cluster fly infestations.

Cluster fly prevention tips

To prevent a cluster fly infestation, you need to remove their access.  We recommend the following tips:

  • Make sure that screens in windows and doors are completely intact; if they are not, repair or replace them.
  • Any gaps that are found around windows or doors should be caulked; cracks in the foundation of your home should be sealed.
  • Any vents should be covered with a tight fitting mesh.
  • Repair or replace any loose or missing roof shingles, and make sure that your home’s chimney is equipped with a tight fitting cap.