I am infested with a pest that is eating only my groundcover(so far) I picked a few up and brought them to Bachmans, the guy there told me they were inch worms. The ugly critters are a grayish green and curl up when I disturb them.

Bachmans recommended a spray, but I don't want to put poison into the ground. I get a lot of birds here not to mention my dog and cat. I did spray with Neem but it didn't get rid of all of them so I reapplied today. Any other suggestions? The groundcover is almost gone I don't want them to start on any other plants when they do run out.