I had a green gravenstien apple tree grafted to MM 106 rootstock that did quite well for several years (planted in 2001). Then some sort of canker set in and in 2010 the trunk was so fissured it looked almost hollow and I cut it down AND DUG UP THE ROOTS. Obviously I didn't get all of the MM 106 rootstock because around 2013 some suckers appeared where the tree had been. I cut most of them out but left the strongest couple to see what would happen. This year I had blossoms and now I have picked about 20 lbs of small, yellow, sweet but mealy apples. They are unlike any other apple varieties I have. The MM 106 stock is supposed to be a 1932 cross with M7 and Northern Spy. Anybody have any idea what I might have? Thanks!