Yellow Sac Spider
Cheiracanthium species
Yellow sac spiders are small (5-10mm) pale yellow to light green spiders with slightly darker jaws. They build small silk "sacs" or tubes in corners rather than traditional webs. They're nocturnal hun...
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How to Identify Yellow Sac Spider
Yellow sac spiders are small (5-10mm) pale yellow to light green spiders with slightly darker jaws. They build small silk "sacs" or tubes in corners rather than traditional webs.
Yellow sac spiders are small (5-10mm) pale yellow to light green spiders with slightly darker jaws. They build small silk "sacs" or tubes in corners rather than traditional webs. They're nocturnal hunters found on walls and ceilings at night.
Yellow Sac Spider Behavior & Habits
Understanding how yellow sac spider behave helps prevent infestations
Yellow sac spiders are active hunters that don't build prey-catching webs. They construct silken sacs in corners and crevices where they hide during the day. They're responsible for more bites than any other spider in the US because they wander at night and often end up in clothing or bedding.
Yellow Sac Spider Risks & Dangers
What yellow sac spider can do to your health and property
Health Risks
Yellow sac spider bites are more common than black widow bites and cause significant localized pain, redness, and swelling. Some people develop slow-healing wounds. While not life-threatening, bites are uncomfortable and may require medical attention.
Property Damage
No property damage, but their silken sacs in corners are unsightly.
Signs of Yellow Sac Spider Infestation
Look for these indicators in your home
Yellow Sac Spider in Boise & the Treasure Valley
Yellow sac spiders are common in Boise homes, especially newer construction. They're responsible for most spider bites in Idaho, typically occurring at night when spiders accidentally encounter sleeping people.
How We Eliminate Yellow Sac Spider
Professional treatment for complete elimination
Yellow sac spider control involves treating wall/ceiling junctions, behind pictures, and other harboring sites. Regular perimeter treatments reduce populations entering from outside. Interior crack and crevice treatments target hiding spots.
How to Prevent Yellow Sac Spider
Steps you can take to reduce the risk of infestation
Yellow Sac Spider Questions Answered
Common questions about identification, prevention, and treatment
Why do yellow sac spiders bite so often?
Yellow sac spiders are nighttime wanderers that often crawl into beds or clothing. Bites occur when they're accidentally trapped against skin. They're not aggressive—bites are accidental defensive reactions.
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