Cluster Fly

Identification: Adult cluster flies are about 3/8" long, dark gray in color and are known for their sluggish behavior.

Habits: Cluster flies lay their eggs in the soil. After the eggs hatch, they enter earthworms as a parasite. In the fall as the days grow shorter and the weather cools the flies will enter a structure to over-winter (usually in attics or wall voids). They become a nuisance within the structure on warmer, sunny days during the winter or on spring days when they are attempting to leave the structure.

Control: The most effective control for cluster flies is an exterior treatment with a residual chemical barrier applied prior to the flies attempting to enter the structure (generally mid to late august). Monroe Pest Control Inc. has specialized treatments for Cluster Flies and offer a full warranty upon completion of services.

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