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Cluster Fly Control in Waukesha County, WI

Pollenia rudis

Low Threat

Cluster flies are a uniquely frustrating Wisconsin pest that invade attics and wall voids in enormous numbers during fall. Unlike house flies, they're sluggish and seek warm spaces to hibernate. On warm winter days, they emerge inside homes, buzzing against windows. In Waukesha County, older homes with attic access points are particularly vulnerable.

Signs of Cluster Flies

  • Sluggish flies on windows
  • Large numbers in attic
  • Flies appearing on warm winter days
  • Dead flies on window sills

Common Locations

AtticsWall voidsWindow framesUpper floorsSouth-facing rooms

Prevention Tips

  • Seal attic vents with fine mesh
  • Caulk exterior gaps
  • Professional attic treatment
  • Install window fly traps
  • Fall perimeter treatment

Wisconsin Climate Factors

  • September cooling triggers attic invasion
  • Warm winter spells activate dormant flies
  • Rural/suburban areas near farms see more

Seasonal Activity

Spring
4/10
Summer
2/10
Fall
9/10
Winter
5/10

Cluster Flies FAQ – Waukesha County

Why do I have flies in my Waukesha County house in winter?

Cluster flies hibernate in attics and wall voids during fall. On warm winter days, they wake up and migrate toward interior light. Professional fall treatment prevents this annual cycle.

Need Emergency Pest Service?

Don't wait when safety is at risk. PIP's emergency team responds same-day across Waukesha County.

Call Now: (262) 893-5271

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