www.arborage.com Arbor Age / July 2014 13
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tion pruning of one stem of a codominant pair both reduced strain on the
remaining stem and reduced strain on the trunk below the branch union."
The trees that were pruned were found to be more resistant to damage from
simulated storm winds than the unpruned trees. "If you're concerned about
storm-related branch failure in a tree with codominant stems or on a tree with
many codominants throughout the crown, by all means employ reduction
pruning of one stem of each pair of codominant stems," said Gilman. With
that said, like all good researchers, Gilman would like to see more studies of a
similar nature conducted to get additional data. "This study gets a real-world
conversation going about how to apply the fi ndings," he added.
Unrelated to the codominant stems research, Gilman and colleagues are
in the middle of conducting a study about how to make removal cuts — aka
collar cuts (he says term "collar cuts" is misleading because in many instances
there is no actual collar to cut back to … so he prefers the term "removal
cuts"). "How do we properly remove a branch when it has no collar?" Gil-
man's study will ask. It has been funded by the Tree Fund, and may be the fi rst
pruning study of its kind.
Michelle Sutton (michellejudysutton.com) is a horticulturist, writer and editor.
Reduction cut on a larger tree; in this case, the cut was made through heartwood
as indicated by the dark area in the center.
