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EVERY WINTER WE RECEIVE a number of calls, sometimes rather desperate about flies that are crawling all over the place. Hundreds of flies and as fast as they are swept up more appear. These flies are called cluster flies. They enter houses in the late fall seeking warm protected places to overwinter. Cluster flies, along with a few other flies, may emerge in great numbers during warm periods in the winter and spring. They do no damage to home furnishings, nor to humans, but are a real nusiance just by their presence.
Cluster flies are parasitic on certain earthworms. The female lays eggs in the soil near the burrows. The tiny maggots that hatch seek out earthworms to feed on. These maggots have never been reared on any other food but earthworms. After reaching full growth, the maggot forms a pupa in the soil and later emerges as an adult fly.
Adult flies of the last generation of the year become numerous during the latter days of September to mid-October. As cold weather progresses, adults seek protected places to spend the winter. In many cases, this is within walls, attics, storage rooms, and basements of homes. Screens offer no protection since these flies prefer to crawl in through small openings elsewhere around the building. For this reason they are extremely difficult to keep out of homes. Isolated homes in the country are especially prone to invasion, since they offer the only warm shelter for miles around.
Satisfactory control of cluster flies is almost impossible, since the over-wintering adults are concealed in walls, attics, etc. The sluggish adults can be picked up with a vacuum cleaner. However, be sure to plug up the end or to burn the bag, if not the flies will crawl back out.
Dichlorvos strips (Vapona) can be hung in the attic and storage closets. When using strips or spray, concentrate the chemical on the sunny side of the house.
If anyone comes up with a better answer for the cluster fly problem, please call and let me know.D
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