Cluster or attic flies are the genus pollenia in the blowfly family calliphoridae.
Flies in attic of the house.
This is the same family to which bottle or blow flies belong.
Overwintering insects generally stay in secluded areas until the warming and lengthening days of spring pull them from hiding.
Attic flies which are also known as cluster flies are insects that often migrate into homes in the fall where they hibernate for the cooler fall and winter months.
Cluster flies come from the calliphoridae family.
Most commonly they move from the ground to your attic for the winter when it gets cold.
They are widely distributed in the united states except for the states bordering the gulf of mexico.
Naturally your house is warmer.
Cluster flies prefer warm areas so homeowners often find them flying around houses on sunny days in the winter and late fall months.
By instinct they seek shelter away from the elements such as in the fall when it gets cold.
Cluster flies are also known as attic flies.
Position light traps so that they are not be visible from outside your house so that the light does not lure new flies into your home.
Place your light traps approximately 4 6 feet 1 2 1 8 meters above the floor.
Cluster flies in the attic cluster flies get their common name from their habit of forming compact clusters typically in wall voids and attics.
Cluster flies are capable of crawling through small openings in the walls of a structure.
Unlike more familiar blow flies such as the bluebottle genus phormia they do not present a health hazard because they do not lay eggs in human food.
A cluster fly is very much similar to a house fly.
Flies are lured in by the light and then trapped on a glue board or killed by an electric shock.
Thus the common name they have of attic flies.
These flies are known as cluster flies a name that describes their habit of clustering in large numbers inside attics.
Cluster flies cluster those large flies in your home in winter are probably cluster flies which overwinter in the protected areas between the inside and outside walls of your home or in the attic or basement.
These flies enter homes looking for overwintering sites during the cold months.
The warmth generated here means that flies are naturally drawn into these cavities and voids particularly during the months of october and november where they congregate in groups or clusters.
Cluster fly larvae develop inside earthworms living in the ground outside of homes.
Cluster flies do not reproduce indoors and home owners bothered by these pests do not need to fear the flies are hatching from a dead animal or other unpleasant material within the attic or walls.