TurkeyCreekTrees,
That is exactly what I’m after and keep coming up short. Scott mentioned Pyrus betulifolia is compatible with European pears but they might grow very large as an example. I think I may have a couple I did by accident already. Every time I ask someone about this topic they don’t know much about it. Starting to suspect not a lot is known about it. This is an interesting article on sweet cherry rootstock http://www.hrt.msu.edu/faculty/langg/Sweet_Cherry_Rootstocks.html. Had someone email me wanting some scions to graft apple to pear or the other way around the other day and I advised against it. I realize there are a few exceptions though I’m not really sure even winter banana apple is as graft friendly on pears as what’s reported. This thread from gardenweb is interesting but nothing implies apples would be a good graft for pears long term http://forums.gardenweb.com/discussions/1454251/anyone-ever-successfully-grafted-pear-scion-onto-an-apple-tree. Would be wonderful to have a book as a resource with the 4 apples that work on pears or 2 peaches that work on certain plum rootstock etc. Apparently plum, apricot, nectarine, almond and peach are compatible with Mariana 2624 plum rootstock shown here http://www.google.com/patents/USPP11403 and discussed here http://www.raintreenursery.com/plantcare/how-to-grow-raintree-plants/rootstocks-plum-apricot-almond-and-peach/. Dave Wilson listed the following rootstock information http://www.davewilson.com/product-information-general/rootstock/comparisons
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