Is there any advantage, (other that possibly size control) of OH x F over
betulifolia? Seems there must be or Westwood would have gone to betulifolia
instead of OH x F, but on paper I can't see any advantage of the OH x F
over betulifolia.(I suspect there weren't the more winter hardy strains
known back when there was as scramble for more decline resistant stocks
after the pear industry's decline disaster several decades ago. What was
the rootsock that caused the loss of so many pears back then, was it
ussuriensis?
Thanks for any help on this
Kevin Bradley