On this weeks call on chickens a member asked where to get Nematodes. Here is the link to a source I know. However, I've never actually used them.
Flea-Away™ Nematodes - Natural Pest Control from Gardens Alive!
Safeguard your yard (and pets) with naturally occurring nematodes. They control fleas and other pests but are safe for people, pets, plants and beneficial insects.
www.gardensalive.com