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Pest NameDescription 
Cluster fliesCluster fliesCluster flies resemble house flies, but are larger and slower in movements. They are about 5/16 inch long, dark gray with black and gray checkered abdomens. Cluster fly larvae or maggots are parasites of earthworms. This makes managing breeding sites an unlikely control option since earthworms are almost everywhere. The adults seek overwintering sites indoors (attics, wall voids, etc.) making them a nuisance pest. In the spring they migrate from their overwintering sites to human living spaces such as bedrooms, kitchens, living rooms, and windows, etc., becoming an unbearable nuisance.