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Rid Your Home of Black Widow Spiders

Updated on February 20, 2017
Black Widow Evidence
Black Widow Evidence

When I think back about our Black Widow house invasion, it started about 18 months before the big infestation. Two reasons made your house ready for the population explosion.

First, when our carpets were removed and we installed engineered wood we started seeing silverfish. Very bad, but the suggestions on the internet were of no help. These bugs were in every corner and cabinet and most likely became the black widow's food.

Second reason was the black widows were outside of the house for the past two years in alarming quantities. My husband would take a flashlight at night, and find and spray for control of the areas we frequent during the day.

At the same time I started to see white spots under the new wood lip of the dining room step, me thinking the reappearing webs the work of a "house" spider.

What Happen Next?

We had the silverfish as food for the spiders in the house and we ignored the white spots. In a few months we had more spider evidence than was acceptable.

We were using boric acid for the silver fish and started to see less and less of them. I am glad for that, because silver fish are very creepy. We are sure the widows helped us with that task. We also had no ceiling webs from house spiders either, for months, also the work of black widows.

So how were we to rid the house of scary black widow spiders?

A Plan for Killing Black Widows Spiders

Time required: Two months

Difficulty: medium

Cost: Less than $10.00


  • Can of Raid roach killer
  • Spray cleaner


  • Shop Vac or house vacuum


1. Be aware of white spots in corners or under tables and chairs. If the spots look like these pinhead sized spics you may have a Black Widow in the house.

Do not ignore.

2. Look under every piece of furniture in the affected area.

This is an entire spider trail used over and over again. Found under a wall unit which was completely closed to view from the front.

3. The white web trail is the black widow's highway. You will also find egg sacs: white balls completely spin with filaments. If you see any black spiders or smaller brown juveniles use Raid and a strong vac to clean everyone out of the area.

Clean all white spots in every area to be able to see if such evidence reappears.

4. This spot is where our problem started about 18 months ago. I continued to clean white dots and wipe away webs. This month we inspected under the rounded lip and saw open cracks that allow a spider to hide. Black widows will run rather than be seen.

We have used clear silicone to seal the cracks and I see no more evidence at this spot.

Be Alert

Update: Feb. 2016. No black widows in the house or a few years. The homeowner's are now both retired and do have more time to keep the home in better order. Jobs are a toll on home care, but are very necessary. Be sure to go to the Internet for possible solutions, someone else has surely gone through the same thing and is willing to tell about it.

Hope this was of help to you.

Homeowners need to alert be to avoid such a black widow infestation. Those white spots are an important clue for unwanted spiders.

Second, the Raid does not have any lasting effect. It is only good for the "first kill". Any new spiders that walk in the area will not be affected. Visualness and attention is the key for keeping unwanted venomous spiders out of your house.

© 2013 Sherry Venegas

Revisit the Affected Areas Till No Black Spider Remains in the House. Be sure to keep Raid and boric acid away from children and pets.

Submit a Comment

  • paperfacets profile image

    Sherry Venegas 23 months ago from La Verne, CA

    The black widow we have in California is seen as north as British Columbia. The northern black widow (Latrodectus variolus) along the eastern U.S. is seen in southeastern Canada. This info from Wikipedia. Thank you for the interest.

  • paperfacets profile image

    Sherry Venegas 23 months ago from La Verne, CA

    We are glad no more hordes have invaded our house.

  • Dressage Husband profile image

    Stephen J Parkin 23 months ago from Pine Grove, Nova Scotia, Canada

    How far North do Black Widows roam? I have not seen any here in Nova Scotia Canada, but we do see some silverfish periodically.

  • BarbaraCasey profile image

    Barbara Casey 23 months ago from St. Petersburg, Florida

    I haven't seen black widows but, here in Florida, we get lots of bugs. Thanks for the identifying pictures. Now I know what to watch for.

  • RonElFran profile image

    Ronald E. Franklin 2 years ago from Mechanicsburg, PA

    I'm reassured that I haven't noticed any spider signs (or silverfish, for that matter). But now I'm alerted. If I begin seeing white spots, I will definitely not ignore. Good info.

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