What kills black widow spiders?

Hello Shirley, I would say a foot covered with a boot could work LOL but I personally wouldn't get that close to one ;) and I am sure you don't want to either, so here is what I found in my search to effectively answer your question:

https://www.doyourownpestcontrol.com/black_widow_spider.htm

https://www.getridofthings.com/pests/spiders/get-rid-of-black-widows/

Well, good luck brave lady (I would probably just move), and thank you for asking Hometalk for answers ;)

I just killed one in my rock garden with Wasp and Hornet Spray. No need to get close and did the job in seconds after one quick spritz.

Maybe Black Widower spiders ....???

I lived in an area with them. They move slow so I'd swat them with a fly swatter. They have a messy web so you know where they live, like in dark places. Keep everything really clean. You will never totally get rid of them as the young have a parashoot (sp?) like webbing that allows them to float on the wind to different places.

My friend gives them a squirt of Clorox Cleanup and swears it kills them dead.

Me..... if they're not in the house I leave them alone, and I'm pretty arachniphobic

Thank you. I'll try that. They are on the fence where they are repairing it.

Aside from spiders, diatomaceous earth is also a safe and effective way to kill silverfish, cockroaches, ants and fleas both inside and outside of your home. ... Instead, a light dusting is the best method to eradicate the spiders and several other varieties of insects from your home.