I am not sure is you want to dwarf a pear tree or an orchards worth.
If you only need to dwarf out a couple you can do what I did which worked
well and keeps them around 8 feet. Start with OHxF 282 or 333 which as the
wondrous Ed mentioned will give you a 12-15 foot tree(unless you plant seckle
in which case you are now done). Next plant in crap soil, I brought in a
bunch of nasty clay and it goes down about 3 feet and I spread it about 16-20
feet long and 8 feet wide for 3 trees. Fifteen year later we are still
talking about productive 8-9 footers. I have Harvest Queen and Harrow Sweet
growing beside my driveway this way. I did this to stop the issue with the
roots cracking the driveway. And predictably i dwarfed them out nice.
In my native soil those same trees woudl probably by closer to 18 feet as are
the Potomca, Magness, Atlantic Queen, Resuce and Bosc I am currently cutting
down (in the power lines).
fluffy
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[NAFEX] runting out a pear,
fuwa fuwa usagi, 08/12/2010