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House Spiders

House Spiders

What are House Spiders?

House spider webs are irregularly shaped and can be located in various places within a home, including windows, ceiling corners and above or beneath fixtures.

The presence of common house spiders (Parasteatoda tepidariorum) is typically characterized by the formation of cobwebs. These silken thread structures can be found throughout infested homes. This abundance of empty webs is caused by the common house spider’s propensity to spin webs in various locations until it finds the most suitable place to catch prey.

Webs are designed as trapping mechanisms and are funnel-shaped, with the narrow end acting as a den for the arachnid. Any contact made with the web produces vibrations throughout the strand, signaling to the common house spider that prey is present. Although common house spiders feed primarily on insects, they may also consume larger spiders, scorpions, rodents and small reptiles.


What are signs of a House Spider?

Signs of house spider infestations include the spider and their webs.

Do House Spiders bite?

House spiders rarely bite unless they feel threatened. However, spiders may defend themselves when crushed in shoes or clothing being put on by a human.

The bites of house spiders are not medically threatening. In the event of severe swelling, lesions or headaches, victims should immediately seek medical attention. If possible, take the spider along for proper identification. It is best to allow a medical professional to determine the best treatment.

How to prevent House Spiders?

  1. Windows and doors should be tightly fitted and any cracks or gaps around the exterior should be sealed. 

  2. Webs should be removed when seen to eliminate the eyesore and to discourage the spiders from building.

  3. Locating possible entry points. They often enter through gaps around windows and doors. Sealing these openings is critical to reduce possible future house spider invasions. Window and door screens can prevent the entry of other insect pests, and the use of door sweeps is suggested. Cracks and other voids within walls and foundations should be sealed with caulking. 
  4. Vacuum to remove webs and egg sacs. 
  5. Webs located outside near can be knocked down.
  6. Apply Scraminator along baseboards, carpet edges, under carpeting, furniture, in closets and shelving where these insects are seen or suspected.