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Bass,
If you see little holes along the branch, then it
could be shothole borer. Shothole borer is the only one i can think of
that would attack the branch. There are many types of borers that will
attack apple trees, but they typically attack at the burr knot from the
graft. M26 is a rootstock that is highly susceptible to borers.
Visit http://extension.missouri.edu/explore/agguides/pests/g07190.htm and
you will see a list of the different borers, where the damage is most likely to
occur and other very pertinent information on how to combat them. Hope
this helps.
Dennis Norton
Royal Oak Farm Orchard http://www.royaloakfarmorchard.com http://www.theorchardkeeper.blogspot.com http://www.revivalhymn.com
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