Stark dwarf rootstock

Hey, a quick question for the crowd…i am cleaning up a neighbors half-freeze-killed asian pears (second leaf), hehad a bunch that were labeled dwarf from starks. The rootstock is incredibly thorny, seems to sucker freely, and feels like weak wood…any thoughts wtf this stuff is?

I do not like it…

Sounds like a Callery rootstock. LOTS of thorns on them, around here anyway.

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Would callery dwarf?

I am not sure actually. Unless they use an interstem perhaps.I know if you contact Stark they could possible give you a few options of what they use as rootstocks. I have done that several times.
What size does it actually get?

No idea, he got 8 the spring before last, cold last winter killed 5 completely and 3 had some scion regrowth.

Mostly curious because whatever they used, i want to avoid it.

Stark doesnt know either. They have no clue what rootstocks they are selling. Been through it with them before.

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Hmmm…given my limited description anyone have any thoughts? Maybe just seedling ussurensis?