On Sat, 14 Jul 2012 12:37:32 -0700 (PDT), gpsman
wrote:


There are no materials specifically for spiders.

Food grade Diatomaceous Earth dusted with a powder duster. Not the
pool DE as it is different. Pool DE will not work.

When they crawl over it, the exoskeleton is cut so they die from
dehydration. You can eat this stuff. Found at a farm supply store.

Safe for everybody...pets, etc.

I've had luck with Sevin dust (don't eat) that killed Black Widows.
Boric acid will also work. When they crawl on BA they start to burn
and dry up (great for roaches).