Anyone have experience on grafting apple-pear/sand pear on dwarf pear rootstock?

Are you referring to quince or ohxf333 or another rootstock? Many things like aronia, cotton easter, hawthorn etc. can be used to dwarf pears. There is different degrees of success based on what you use. Apples and pears are not compatible but they are pomes so they can be partially compatible at least for a time. Apples such as winter banana are more compatible with pears than others. There are much better choices for dwarfing apples than pears.

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