Face Flies - School IPM - USU Extension

    Face Fly

    Musca autumnalis

    face fly

    Face fly (Clemson University, USDA, Bugwood.org)

    Face fly:(Janet Graham, Wikimedia Commons)

    Face fly (Janet Graham, Wikimedia Commons)

    face fly

    Face flies (Clemson University, USDA, Bugwood.org)

    Identification

    • nearly identical in appearance to the house fly
    • dull gray color
    • four dark stripes behind head
    • tuft of bristles at the base of the calypter

    Nesting Habits

    • lay eggs in fresh undisturbed cow manure
    • seek indoor overwintering sites in late August – early September

    Diet

    • larvae: cow manure
    • adults: watery secretions around eyes, nose and mouth of cattle; flower nectar

    Significance

    • come from farm/ranch areas with fresh cow manure
    • congregate on south/southwest- facing walls in late summer – early fall
    • large numbers will congregate within wall voids during winter (similar to cluster flies)
    • frequently seen in windowsills and light fixtures during unseasonably warm days during winter

    IPM Recommendations

    • Verify identification to determine appropriate management.
    • Seal exterior building cracks throughout summer in areas where flies have been problematic in previous years.
    • Tolerate occasional face flies during overwintering months; use a fly swatter; vacuum.
    • Search for overwintering flies in voids and mezzanines and vacuum them.
    • Use an appropriately labeled insecticidal dust in voids and cracks and crevices where flies overwinter.

    Additional Resources

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