I have 2 semi dwarf apple trees and want to know what kind of rootstock are they on. I have a feeling they are most likely M9 but I don't knoe for sure. I bought them from sheridan nurseries whom inturn bought them from mori nurseries. I also want to know where one can find "vineland 1" and/or "geneva 65" rootstocks. I have done some research and concluded they are the better choice of rootstock to avoid fire blight and collar rot.