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)