If it was done, I'm sure the grafting union did not last very long. I refer
to this web site for reference:
Interstems are used to graft pears onto quince rootstock. I have only heard
of them used to graft a pear onto an apple using a variety of apple called
'Winter Banana', but I have no facts to back this up.
I am only concerned here about the apples and pears on eachother.
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