Cluster Flies

Latin Name:

Size:7 mm (0.25

Life Expectancy:Varies

Problems:Potential damage to property


Behaviour, Diet and Habits:

During the autumn and winter months, Cluster flies  can be found overwintering inside of attics or lofts. This species can be found grouping or “clustering” near the interior openings of a warm structure.  When there is a sudden drop in temperature, cluster flies shift to the interior of structures, holes in trees, loose bark, or other crevices and cavities and this can cause problems.

Fly problems:

Cluster flies tend to enter homes and buildings in large masses in late summer or early autumn to seek shelter for the winter months. They can squeeze their bodies through any exterior crevices of a home, such as cracks around windows and doors, air conditioning vents, screening vents, and loosely hung siding. Once they enter a structure, they usually hibernate in inaccessible areas between walls and in ceilings until spring when they emerge and seek access to the outdoors. Although they generally do not cause any true damage to home structures, textiles, foods, or humans, many dead flies piling up in the walls can sometimes lead to secondary infestations of carpet or larder beetles and rodents, which feed on the flies.


Minimizing Fly Problems:

To minimize flies entering your property, be sure to properly seal off entry ways into your dwelling, including windows, doors and any other openings.


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