How to stop spread of cluster flies | Detroit Lakes Online
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How to stop spread of cluster flies

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Over the past few weeks, we have been fending off a bumper crop of large, often slow moving flies. These flies are known as cluster flies, a name that describes their habit of clustering in large numbers inside attics.

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Cluster flies develop as parasites inside the bodies of earthworms. There are three generations of flies produced each summer, and the final generation of the season migrates to houses and other buildings during mid to late September.

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