I'm still not completely sold on the genetic rootstock for a wildlife setting where I hope to use a permaculture of fruit and nut bearing trees as part of a long-term program to feed deer. There is certainly something to be said for breeding rootstock for disease resistance but I'm not sure it is the final answer. While clonal rootstock is bred to resist certain diseases, it is genetically fixed while disease continues to mutate and adapt. As large volume of trees are genetically stagnated at a specific variety with a specific clonal root stock meet changing disease that outwits them, I can see large groups of trees suffering. When disease and trees mutate and adapt together you don't often see disasters like the chestnut blight. In that particular case the disease was geographically isolated from the trees for many years and that isolation broke down.
So, I'm cutting the baby in half. I'm using both clonal rootstock and named variety scions as well as seedlings with named varieties and with productive wild trees. I love the idea of grafting at the 5' level with seedlings. This allows for a few branches of the original seedling to be preserved. In cases where the apples they produce have qualities I like, they become a scion source for other seedlings that are less productive. Yet, I will have a known quantity growing above those native branches to protect my time and effort investment.
It will take plenty of time to see how well this method works, but it is the path I'm currently on. For my soils and area M111 is the best clonal rootstock for me.
Thanks,
Jack