About Cluster Fly
Cluster flies (Pollenia spp.) are slightly larger than houseflies at about 10 mm, recognizable by golden-yellow hairs on their thorax and a sluggish, clustering behavior in warm indoor spaces. They are parasitoids of earthworms during their larval stage and are ecologically harmless to humans, neither biting nor breeding indoors. In late summer and autumn, however, entire populations of adults from surrounding fields converge on buildings to overwinter, clustering in upper walls and attics. On warm winter days they descend into living spaces in bewildering numbers. Rural homes surrounded by pasture are most often affected.
Geographic Distribution
This insect is found across Africa, with notable populations in Egypt and surrounding regions.
Management
If you suspect a Cluster Fly problem, consult our recommended exterminator services or browse our full pest species database for related species and control guidance.