Hobo & Grass Spiders - School IPM - USU Extension

    Hobo and Grass Spiders

    Agelenidae

    Hobo Spider

    Hobo spider (Ryan Davis, Utah State University Extension)

    House spider

    Domestic house spider (Sanchom, Wikimedia Commons)

    Grass spider & other image Funnelweb-type web made by grass spiders, hobo spiders and other funnelweb spiders (David Stephens, Bugwood.org)

    Adult grass spider (Joseph Berger, Bugwood.org)

    Identification

    • adult bodies up to 3/8 inch long (longer including legs)
    • robust, fast moving spiders
    • many funnelweb spiders look similar; verify your spider identification with Utah State University Extension

    Nesting Habits

    • outside in grass, gardens, ornamental plants and trees, along foundations, log piles, under rocks and lawn ornaments, etc.
    • often found in tubs and sinks, or running along the floor indoors

    Diet

    • insects

    Significance

    • hobo spider: evidence suggests that hobo spiders do not cause necrotic lesions in humans
    • very common indoors between August and October
    • spiders should be considered beneficial

    IPM Recommendations

    • Minimize nesting habitat around property (rocks, logs, etc.).
    • 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)