This drug appears to be quite interesting.

It is a combination of milbemycin oxime (which is what Interceptor is based on, and is an excellent wormer in the same general class as ivermectin) and a newly-developed, organically-friendly product called Spinosad.

This is the first time I have heard of it, so I can't comment too much right now, but it does look to be a very promising, environmentally-sound product to use.

Have you tried it?

Jack