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A closer inspection showed girdled bark on all the dead branches, no bark damage on the live branches.
Conclusion: Rodents sheltered in the hedge during the deep snow of winter ate the bark, killing some but not all the branches.
Additional comments from my forester father: "Pulling out a dead branch is one of the
first things after having a look from about 15 or 20 feet away. Then one can
look for borer insect holes, teeth marks, fungi or whatever up close with
the "ever present" 10x glass one carries on a string. In this case, the
tooth marks size will probably tell you which rodent is guilty.
There's also a "snow mold" that is frequent on cedar type plants.
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