Cluster Fly Control
Cluster flies overwinter in attics and wall voids and emerge in mass on warm winter and spring days, appearing at windows.
Identification
Slightly larger than a house fly, sluggish, checkered gray-gold thorax.
Biology
Larvae parasitize earthworms; adults overwinter in structures.
Behavior
Cluster on south-facing walls in fall, then squeeze indoors for winter.
Health Risks
None direct.
Property Damage
None — nuisance only.
Signs You Have a Problem
- Dead flies at windows in spring
- Live flies indoors on warm winter days
Our Inspection Process
Our licensed technicians perform a thorough interior and exterior inspection to confirm cluster flies activity, identify harborage, moisture, and food sources, and map entry points. Findings are documented with photos and a written treatment plan tailored to your Hudson Valley, NY home.
Treatment Process
Late September / early October perimeter treatment of exterior walls, soffits, and window frames. Treatment inside the wall void is not effective.
Integrated Pest Management
Urbanxterminator uses Integrated Pest Management (IPM) for cluster flies: inspection, monitoring, sanitation guidance, mechanical exclusion, targeted low-impact products, and follow-up verification. We prioritize methods that are effective for you and your family while minimizing environmental impact.
Prevention Tips
- Seal gaps and repair screens before September
- Book fall treatment early