I have the Air Potato Beetle on what I used to call African Yellow (Dioscorea cayenensis) that some folks feel is just a form of D. alata. Just one beetle, I killed it. Those of us who grow the true yams have been trying to let folks know when they get it. A student in Temple Terrace has it, and Andy Firk and other gardeners in Florida are reporting damage to several cultivars vs. only the Air Potato (D. bulbifera) the state release targeted. Yams have been a staple for me here for more than 10 years...I sure hope it doesn't wipe them out, especially my beloved Purple Ube from the Philippines.