Cluster Flies Behind The Siding

Once inside cluster flies will hide and are usually not seen by people.

Cluster flies behind the siding.

They will overwinter inside structures in walls attics under siding within voids of overhangs in basements and in other sheltered locations. Spray it lightly as needed for contact kill. To prevent cluster fly infestation you could use following tips. 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.

To prepare for the next season you can spray areas where you suspect these pesky flies will cluster. Cluster flies especially love decomposing food and sweets. Homeowners are often bothered by sluggish flies in their homes in late winter and early spring. Fill all the cracks or crevices in walls window or door frames with caulking.

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. These flies are collectively called clustering flies but may actually be any of the three most common types of flies. There is a newly patented canadian invention new meaning 2001 called the cluster buster that has the remarkable ability to attract and immobilize up to 1000 cluster flies when placed on the inside of a window pane. 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.

A contact pyrethrum spray like cb 80 which is approved for indoor use can help as well. If the siding of the building is tight then the flies have less oppportunity to make their way into the structure. 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 about 8 to 10 mm 31 to 39 inches long.

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. They mate after emerging in the spring. Both face and cluster flies overwinter in structures and are nuisance flies.