The only thing i've had evade the DE around here are spiders. ...and that's fine with me. I like most of the spiders we have (even though i'm spider-phobic.)

I can see fleas easily jumping over it though (if you had a line drawn with it.)

Quote Originally Posted by dragondawg
diatomaceous earth is great for keeping slugs and snails off your dog. Not sure how many dogs have such problems. The whole idea of diatomaceous earth is that soft belly critters that crawl, will crawl over the diatomaceous earth and scrape up their abdomens. In the case of snails and slugs in the garden the abrasions cause them to become dehydrated and die. You have to reapply it to the soil after each rain.

But for fleas they should be able to walk or jump over the crystals, with no effect to themselves.