Looks like a shield bug; a relative of the stink bug. They seem to be partial to bean vines but will get on almost anything. Neem oil is probably your best organic control. Use neem oil carefully in the evening so you harm as few bees and predaors as possible. http://images.search.yahoo.com/sear...h,20100521,6685,0,8,0&fr2=tab-web&fr=slv8-w3i