I've never noticed any here suckering, but after reading online about them, don't doubt they do at least in certain situations.
I just checked and Guy still sells his on wild rootstock, but will graft to ohxf97 if requested.
On my multiple variety tree, it was a 10' or so volunteer to start with. Chuck wanted to try several Perry pear varieties and since it's at the back of the farm I added them to it as a test then I've been changing all the other branches over to useful types.
I'm quite positive it will split down the middle in a storm one day, but I hope not before I can see how the Perry pears hold up to our fireblight pressure.
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