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["Lon J. Rombough" <lonrom@hevanet.com>]

Obviously there is variation in the success of the graft.  Mileage will vary by combination of species and varieties within species on any plant.
-Lon Rombough
Grapes, writing, consulting, my book, The Grape Grower, at http://www.bunchgrapes.com  Winner of the Garden Writers Association "Best Talent in Writing" award for 2003.
On Jan 13, 2007, at 6:37 AM, Jim Fruth wrote:

Lon said:  "Medlar, quince, Sorbus, Amelanchier, loquat are all graft 
compatible
with pear."
-Lon Rombough



There is an unobvious problem connected with off-species grafts.  A 
visitor to the walnut orchards in California can see peculiar looking trees, 
walnut trees whose bottom portion of the bole is a smaller diameter than the 
upper portion.  Eventually those trees strangle themselves.  I have a 
similar thing happening in my orchard where I grafted a fast growing plum 
onto a slow growing rootstock.  These trees of mine need to be held upright 
with crane-like supports or they either topple over in the wind or just 
outright break off.  In comparison, grafting a pear onto an Amelanchier or 
Loquat, etc. would likely have a similar result.