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["oliver smith callis" <oliversmithcallis@gmail.com>]

Thanks for the replies & suggestions. I should have clarified I do not own or control the property (which is at risk of being developed) and am limited to propagation strategies to preserve this rootstock & variety. For the rootstock- I though I might dig up one of the roots and expose part of it above ground, protect it with a milk carton with the bottom cut off (staked to the ground), add some fertilizer and see if I can't get it to sprout. Then sever the root from the tree and replant it. Does this seem feasible? Also, what if I took root cuttings, dipped them in rooting hormone and left them in a rooting medium-vermiculite type mixture...
Much appreciated, 
Oliver