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Treasure Valley spiders

The treasure valley is home to many types of spiders.  Black Widows, Hobos, Wolf Spiders, & Jumping Spiders are just a few that we encounter, but rest assured, there has never been a spider problem that we can’t handle!  Regular treatments are suggested as the best way to keep them out of your home or business, we even sweep off your siding to get rid of any webs!  Here are a few things you can do to help:

  • Keep all vegetation well trimmed and at least 1 foot away from the home.  Lawns should be cut to a proper height, and cut regularly.
  • Seal cracks in foundation, install screens on doors and windows, assure doors & windows are properly sealed, etc.
  • Install door sweeps or thresholds to all exterior entry doors. Install a rubber seal along the bottom of garage doors.
  • Decrease the amount of nighttime lights that attract flying insects that are food for spiders.  Use yellow light bulbs where possible as they attract flying insects less.
  • Decrease clutter indoors:  Especially in garages, basements, etc.
  • Clear out debris from around the home:  Woodpiles, construction materials, should be as far from the home as possible
  • Maintain proper sanitary conditions in and around the home


The Black widow spider is largely known for their dark, shiny bodies with the characteristic red hourglass shape on the underside of the abdomen.  They spin their irregular webs under woodpiles, along foundation walls, in vegetation, and may enter homes or structures on occasion.  Their bit is dangerous; the venom is known to be one of the most toxic venom among all spiders in the world.


The hobo spider is one of the more feared in the treasure valley.  A large spider, they can reach an overall length of 2 inches.  They weave webs that are funnel-like in rubbish piles, near foundations, under wood or rocks, or in vegetation.  The hobo spider is typically brown to light brown, hairy, fast, and has two boxing-glove type polyps that protrude from the front of the body.  Hobo spider bites result in a necrotic lesion that essentially kills the tissue surrounding the bite that is very painful and severe.


Jumping spiders are known for 2 things:  Their prominent multiple eyes sets, and, obviously as their namesake suggest, jumping.  These spiders differ in color, varying from black to brown to gray, and hairy.  Jumping spiders are active and successful hunters, not relying on webs to trap prey, but by using their quickness and ability to jump on unsuspecting insects.  Not dangerous to humans, jumping spiders are typically classified as nuisance pests that are seen often in vegetation, near windows, or other areas close to insects that could provide an easy meal.


In Idaho, wolf spiders are often confused with hobo spiders.  Though coloration is often the same (light to dark brown) they are different and not nearly as dangerous.  Typically a little smaller than hobos, their adult length is maximum only slightly longer than an inch.  They are hunting spiders, depending on their quickness to find prey.   They are found often under wood or rocks, wood piles, under litter, etc.  The wolf spider bite can cause redness and mild irritation but nowhere near the severity of a hobo or black widow bite.