Cluster Flies Behind The Siding

Homeowners are often bothered by sluggish flies in their homes in late winter and early spring.

Cluster flies behind the siding.

Cluster flies are about 8 to 10 mm 31 to 39 inches long. On warm days in early winter or when homeowners turn on indoor heat the flies become active and move toward the warmth. A contact pyrethrum spray like cb 80 which is approved for indoor use can help as well. To prevent cluster fly infestation you could use following tips.

Fill all the cracks or crevices in walls window or door frames with caulking. Based on casual observations cluster flies seem to be attracted to light colored buildings. Cluster flies especially love decomposing food and sweets. To get rid of existing cluster flies many people simply vacuum them up and empty the vacuum outdoors.

On the homes siding in the attic and deep in the wall voids where cluster flies like to nest should be dusted with drione dust. Insects such as flies are naturally drawn to vinyl siding because vinyl siding attracts build up of airborne sugar particles from nearby trees plants and brush. They mate after emerging in the spring. Once inside cluster flies will hide and are usually not seen by people.

Make sure to seal every possible hole or crack like around windows doors siding behind chimneys utility pipes underneath the fascia etc in the building. Both face and cluster flies overwinter in structures and are nuisance flies. These flies are collectively called clustering flies but may actually be any of the three most common types of flies. Spray it lightly as needed for contact kill.

Unlike brick or wood homes the sugar particles which may not be detectable to the human eye stick to the vinyl siding causing flies to gather. They will overwinter inside structures in walls attics under siding within voids of overhangs in basements and in other sheltered locations. Using a crusader you can puff small amounts up under the exterior siding into any cracks or crevice common to log homes and into all crevices they might choose to use for hibernating. Cluster flies are overwintering meaning they will try to enter a home or building in the fall as temperatures begin to cool in search of a warm place to survive the winter.