Placement of Predators - Fly Predator Questions - Fly Control Support - Spalding Labs

Placement of Predators

Fly Control Support

Fly Predators have helped keep flies to a minimum without pesticides for hundreds of thousands of customers over the past 42 years. They're the smart way to avoid “Fly Season”.
Fly Predator Questions

Placement of Predators

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Location: Southern Wisconsin. We don't own any large outdoor animals. We have 2 kitties outside and 1 small dog inside. We live on 30 acres with woods, creek, and two neighbors 1000 ft away. One has 2 donkeys, the other has a dozen chickens. Our problem seems to be that flies have infested the walls of our home. Built new 12 years ago but using hand-hewn timbers from a 150 year old barn. We don't want Fly Predators to infiltrate our home, right? It's December now, but in the spring should we order predators and just sprinkle them outside and hope for the best?

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  • Becky,

    It sounds like you may be experiencing problems with cluster flies.  Cluster flies are actually parasites on earthworms.  The adults emerge in late summer and early fall and migrate into homes and buildings to overwinter as adult flies.  Cluster flies are fairly unique in that aspect as most other fly species overwinter as pupae in the ground.  Although Fly Predators are capable of attacking cluster flies, a great deal depends on how close to the surface infected earthworms are when the cluster fly larvae leave the earthworm to pupate.  We have had some customers find success in reducing cluster fly numbers by spreading Fly Predators monthly from mid-late summer into early fall.  They would not be any help in the spring when the adult flies are coming out of homes and buildings.  It would be worth trying Fly Predators once in the mid to late summer through early fall and see if that reduces the numbers coming into the home.  Unfortunately, as I mentioned, there is no good scientific research to support Fly Predator success with Cluster Fly, but we've had many customers tell us it happens to help with those as well as their regular nuisance flies.  If you have any other questions, please let us know.

    Thank you,

    Jessica