Online info shows a map for this critter as European through Asia, NOTHING in the Americas. Three inches long, at least 3/8 inch in diameter medium green with white vertical stripe and a menacing looking purple spine near one end, regrettably poorly visible in the photo. Concerned that this could be a new import which mysteriously showed up in my 11 year old garden, I would appreciate your advice on what to do to, or, with it. It devoured a medium sized, recurrent  moon flower (angel trumpet) bush. It emits  waste which blackens when exposed to normal air. Currently constrained to a container with limited  breathing holes, waste presents as medium brown. Could you show me into what it would transform ?