Holmberg writes
Yes, Evercide Total Release Bombs will kill black widow spiders if they are exposed during the treatment. Spiders that are hiding in concealed locations during the actual application will not be contacted with the wet spray and most likely not be eliminated. In most cases, eliminating the spiders food source (other insects) will help get rid of the spiders, they will either die of starvation or will move to a location with a food source.
Answer last updated on: 03/02/2010