Larry,
Can you let us know the age of those Northern Spy at the time you saw
the situation described? It would be useful to know this tree age
was specified in the MI example, and figures prominently in
Rosenberger's cited Marshall Mac situation in New York and New
England. Thanks.
Kevin Iungerman
Greetings,
I had what sounds to be the exact same problem a number of years ago
with Northern Spy on M-26. The most vigorous trees were the most
seriously affected. We had a heavy crop the year before and a long
wet fall. The tops had long sunken, purplish lesions, and they died
from the tops down. The bottom foot above the union was still good
in most cases. Some tree I pulled out and the rest I cut off below
the lowest lesion. Within three years I had the trees back almost as
large as they were. I shouldn't have pulled the others in hindsight.
It affected about fifteen to twenty percent of the trees in the
block.
We had some isolates taken, and as I recall it was identified as an
aerial version of Phytophora. No one locally had heard tell of this
organism causing symptoms above the crown. This block was on well
drained, gravelly loam soil, so there was no water ponding or
imperfect drainage.
The only good news is that the trees recovered and it hasn't been
back since in that block, although I do see it occasionally in other
blocks of different varieties and rootstocks. I saw some on Idared
on MM-111 that were at least 25 years old recently.
Mark, I am sure I still have some pictures that I could send you for
comparison if you like.
Regards,
Larry Lutz
Nova Scotia
From: [email protected] [mailto:[email protected]]
Sent: April 8, 2010 9:42 PM
To: [email protected]
Subject: Apple-Crop: sickness in the Pioneer Mac block
Hello all,
In 08 a neighbor with a 5 yr old Pioneer Mac block on G30 saw
extensive amounts of die-back in his trees, starting with trees
hanging onto their leaves going into late fall. Spring of 09 showed
that the most vigorous trees were affected to the greatest degree
with whole limbs, leaders and some entire trees dying.
Everything looked good in the spring of 09 in our orchard, which is
7 yr old P-Mac on M26. We wondered if our neighbor had a problem
because of G30. Many "experts" looked at his trees and the
consensus was "winter injury". In early October we harvested our
block and noticed nothing of concern (except scab). In mid-November
we saw trees throughout the block with dark leaves that refused to
fall. The most vigorous trees seem to be the most affected. Whole
limbs seem to die from the tip to or near the truck. Leaders often
turned dark brown down to just above the lower scaffold limbs.
Trunks below this point are mostly unaffected. Most trees seem to
be O.K. at this point in time but nearly 20% of the block has some
degree of this malady.
None of our other varieties have this problem.
Does anyone have experience with this sort of situation? Any ideas
would be appreciated.
Mark Evans,
Northwest Michigan
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Kevin Iungerman, Extension Associate
Cornell University Cooperative Extension's Northeast NY Commercial
Fruit Program
50 West High Street, Ballston Spa, NY 12020
Phone: (518) 885-8995
FAX: (518) 885-9078
email: [email protected]
website: Coming in 2010.
Providing Equal Opportunity Commercial Tree Fruit and Grape Research,
Education and Programming with the Support of the Farmers and Cornell
Cooperative Extension Associations of Albany, Clinton, Essex,
Saratoga, and Washington Counties, and Cornell University's College
of Agriculture and Life Science.
Serving NY's Upper Hudson and Champlain Region - Home to Premium Cold
Hardy Orchard and Vineyard Fruit, Including: McIntosh, Honeycrisp,
and Sweetango Apples, and Marquette and LaCrescent Grapes!
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