Ground Spiders - School IPM - USU Extension

    Ground Spiders

    Gnaphosidae

    Ground spider

    Adult ground spider (Joseph Berger, Bugwood.org)

    Ground spider

    Adult ground spider (Joseph Berger, Bugwood.org)

    Ground spider

    Adult ground spider (Joseph Berger, Bugwood.org)

    Identification

    • many different kinds; typically earthtone coloration
    • found crawling around (not within a web)
    • two large spinneretts sticking out the rear of the abdomen are even in size throughout their length (rather than tapering toward the end)

    Nesting Habits

    • found in leaf litter, grasses, ornamental plantings, areas around buildings
    • make web chambers in which they lay eggs
    • are active hunters that wander in search of food

    Diet

    • insects and other spiders

    Significance

    • nuisance when indoors
    • not known to be a health hazard
    • beneficial

    IPM Recommendations

    • Minimize nesting habitat around property.
    • Seal exterior cracks and crevices.
    • Install tight-fitting door sweeps at the base of all exterior doors.
    • Vacuum individuals that enter buildings.
    • Step on or smash individual spiders that enter.
    • Catch and release (with a glass jar) spiders found indoors.
    • Change exterior lighting to sodium vapor bulbs.
    • Use pest monitors to capture invading spiders, especially between August and October.

    Additional Resources:

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