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CLUSTER FLY INFORMATION & FACTS

(Diptera: Calliphoridae)

Overwintering adults of the cluster fly, Pollenia rudis Fab. are an annual problem in many houses. Cluster flies are slightly larger and darker than house flies, and have a coating of short golden hair on their thorax. These flies normally live outdoors where they occur on flowers and fruits. In late summer and fall, when the weather turns cool, cluster flies may congregate on sunny walls. They enter the home to overwinter through any available access. In the home, the flies hide, often in a cluster in attics and wall voids, in dark corners, cracks, under clothing in closets, beneath curtains, behind pictures and furniture etc. On warm, sunny days in the winter and spring, the flies often emerge from their hiding place and swarm on windows causing great annoyance by their buzzing and by their presence. Dead flies provide a food source for larder beetle larvae and can contribute to the presence of other nuisance insects in the house.

In April cluster flies lay their eggs singly in cracks in the soil. During the summer, the eggs hatch and the emerging larvae (maggots) penetrate earthworms and develop as a parasite in its host. There are several generations during the summer. The adults stop egg laying in late August and September, and seek hiding places in which to overwinter. Most of the flies spend the winter outside in and on fenceposts, under stones, and in other protected places. Cluster flies are usually a greater problem in rural and suburban areas due to the large grassy areas that favor high earthworm populations.

Cluster flies are not related to livestock production. They do not develop in manure or manure pits. They are not interested in food, do not develop in garbage, and are not a sign of unsanitary conditions.

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Trevor Dixon
3 weeks ago

I want to thank Sarah! She really did a amazing inspection! I had a issue with mice. Sarah cover the inside and outside taking care of holes/gaps above the front and back doors. attics and garage. And has a very caring attitude towards her clients! I have know about Environmental Pest control for many years as they looked after issues with a school board I worked for.


Margo Dixon
3 months ago

We just had a fall treatment done at our country property. We never hesitate to call this company to protect us from ladybugs, cluster flies and more. You can count on them for punctuality, professionalism and thoroughness. Shout out to Cody who went above and beyond today: on his own accord, he brought our garbage/recycling bins to our garage door from the road and was able to retrieve a helium balloon that had floated up to the top of our cathedral ceiling. We are seniors, so these gestures of kindness were most appreciated. Highly recommend!


Sherrie Lee Hawley
5 months ago

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Heather Lundberg
3 months ago

I recently had the bait boxes refilled to avoid having mice move into my house as the weather turns colder. Mike and Jake arrived at the appointed time. Both gentlemen were polite, friendly and very professional. When they left, I contacted Kassandra to arrange payment. She was lovely, pleasant and polite, a pleasure to speak with. I have used the services of this company for years and have always been pleased.