Blow Flies - School IPM - USU Extension

    Blow/Bottle Flies


    Bottle Fly

    Blue bottle fly adult (Obsidian Soul, Wikimedia Commons)

    G Bottle Fly

    Green bottle fly adult (Julia Wilkins, Wikimedia Commons)

    Blow Fly

    Blow fly larvae (Joel Smith, Utah State University)


    • medium-sized and robust with a metallic appearance
    • metallic-looking green and blue are common forms

    Nesting Habits

    • eggs may be laid on dead animals, garbage/dumpster receptacles, decaying organic material and manure
    • many flies indoors may indicate that an animal has died in a wall void or somewhere within the building


    • larvae feed on on animal carcasses, garbage, decaying organic material and manure


    • can spread disease through contact
    • nuisance inside buildings

    IPM Recommendations

    • Keep exterior doors closed, install screen doors, or install an automatic door closer, especially on doors leading into the kitchen.
    • Keep screens in good repair.
    • Improve sanitation.
    • Keep dumpsters at least 50 feet from the building.
    • Locate breeding susbstrate, if possible, and remove.
    • Keep trash cans, dumpsters and garbage areas clean and free of odor.
    • Close lids on dumpsters and garbage cans.
    • Exclude fly entry via caulking, weather stripping, door sweeps, etc.
    • Properly place light traps to catch flies that come indoors.
    • Use a fly swatter.

    Additional Resources

    IPM for Flies: Integrated Pest Management in Sensitive Environments (University of Nebraska-Lincoln Extension)