Cluster Flies Behind The Siding

Spray it lightly as needed for contact kill.

Cluster flies behind the siding.

Cluster flies especially love decomposing food and sweets. 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 get rid of existing cluster flies many people simply vacuum them up and empty the vacuum outdoors. 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.

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. If the siding of the building is tight then the flies have less oppportunity to make their way into the structure. Fill all the cracks or crevices in walls window or door frames with caulking. They will overwinter inside structures in walls attics under siding within voids of overhangs in basements and in other sheltered locations.

A contact pyrethrum spray like cb 80 which is approved for indoor use can help as well. They mate after emerging in the spring. 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. 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.

On warm days in early winter or when homeowners turn on indoor heat the flies become active and move toward the warmth. Once inside cluster flies will hide and are usually not seen by people. To prepare for the next season you can spray areas where you suspect these pesky flies will cluster. Homeowners are often bothered by sluggish flies in their homes in late winter and early spring.

Based on casual observations cluster flies seem to be attracted to light colored buildings. Cluster flies are about 8 to 10 mm 31 to 39 inches long. To prevent cluster fly infestation you could use following tips. These flies are collectively called clustering flies but may actually be any of the three most common types of flies.