I've never tried it, but I heard Juicyfruit gum will kill them. Put gloves on so your scent isn't on the gum. Roll it into a ball and place in one of the tunnels. They will eat it and it blocks their digestive system. I still rely on my cats and a pitch fork. Gross but satisfying. Mike Bordelon Greenhouse Manager Department of Botany Smithsonian Institution 301-238-3130 MNHBO102@SIVM.SI.EDU