I think it can be more than just KSDS in some cases. I have no idea whether it is a 60 or 90 chromosome rootstock, but I have one tree that has thrown off a total of 20 grafts (including chip, bark, whip and tongue and clefts), the last round being all American varieties. I just posted the final failure in the persimmon grafting thread, where I had shown the previous failures and had previously decided it must be KSDS. It looks like it is just a very antisocial rootstock.
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