Cluster Flies Behind The Siding

Fill all the cracks or crevices in walls window or door frames with caulking.

Cluster flies behind the siding.

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. To prepare for the next season you can spray areas where you suspect these pesky flies will cluster. These flies are collectively called clustering flies but may actually be any of the three most common types of flies. Based on casual observations cluster flies seem to be attracted to light colored buildings.

Both face and cluster flies overwinter in structures and are nuisance flies. To get rid of existing cluster flies many people simply vacuum them up and empty the vacuum outdoors. They will overwinter inside structures in walls attics under siding within voids of overhangs in basements and in other sheltered locations. 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.

Cluster flies especially love decomposing food and sweets. A contact pyrethrum spray like cb 80 which is approved for indoor use can help as well. Homeowners are often bothered by sluggish flies in their homes in late winter and early spring. Cluster flies are about 8 to 10 mm 31 to 39 inches long.

Spray it lightly as needed for contact kill. If the siding of the building is tight then the flies have less oppportunity to make their way into the structure. 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. On warm days in early winter or when homeowners turn on indoor heat the flies become active and move toward the warmth.

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 mate after emerging in the spring. 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. 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.