Cluster Flies

Cluster FliesHave you ever sat and watched these little flies doing “the Square dance?” you know, the one where they hover in one area going in what seems like an eternal square rotation?
Or the sluggish leisurely golden brown cluster flies that like to hover around the window stills or attics and other dark places.

Their relentless cluster of shape flying is kind of funny, definitely annoying and not a good sign in the home, or at a business like a restaurant or café.

Ecomist Central NZ owner/operator Kevin Godfrey says, “In the next 6 weeks cluster flies can become a problem due to the temperature change – and the cluster flies are looking for a place to hibernate over the winter.”

Kevin, suggests 3 key things:

1) Survey dark areas like roof spaces, garages, cracks and crevices for signs of cluster flies
2) Keep the Ecomist Dispenser going to target the flies, and Sniper residual insect spay is also recommended to target where they land, on windowsills and cracks and crevices.
3) To remove dark brown spots left by cluster flies, wash walls, window sills and other areas with detergent and warm water…

Their breeding habits over Spring means they are outside depositing eggs into the soil –and feeding off earthworms over the summertime. Places like farms and wetlands have quite a problem with them here in NZ. But as autumn kicks in so do their survival instincts, which means they are gravitating inside for shelter over wintertime.
No one wants to walk into a room or their attic and see this kind of sight:

Facts about cluster flies:

– Adult cluster are slightly larger than the common house fly,
– Not to be mistaken by the Lesser Housefly fly which are smaller, and hover in circles while not landing on anything.
– Cluster flies do not have that typical metallic appearance. They have  black markings and have golden-yellow hairs on the thorax and under their body which gives them a golden brown look.
– They let off a pheromone that signals other cluster flies to head over to where they are, thus forming a large group or cluster.
– In the cooler months and over Winter cluster flies migrate in large numbers to warm dry areas where they hibernate over the winter time before they begin their breeding cycle outdoor in the Spring.

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