[NAFEX] Wild(?) pear question
Lon J. Rombough
lonrom at hevanet.com
Fri Sep 4 11:03:46 EDT 2009
Pyrus betulafolia is one of the preferred stocks for resistance to pear
psylla. The main problem is that most of the material in the U.S. came
from the southern part of the species' range and isn't hardy. But
there is material from the northern part that is very hardy. In 1990 I
sent seed of it from the Germplasm Repository to Wayne Fuhr in Canada.
He reported that young trees took -40 in November with only slight
damage at the ends of twigs. I have had a row of seedlings of that
material for some years and I think they have real potential.
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On Sep 4, 2009, at 7:49 AM, Kieran &/or Donna wrote:
No, the one thing I read every time about calleryana is that it's NOT
hardy as a rootstock. That leaves P. ussuriensis as the most likely
candidate. Okolo is a ussuriensis offspring that may be hardy enough
for you, from Dr. Hansen's work I think. I didn't get good takes from
my grafts of that one, but if you'll look at the Corvallis site, they
have a list of hardy pears. You'll want only the very hardiest. You
can call for nominations right here.
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