Backyard Orchards, chronicling, musing and more

Glad that you also posted it on the InsectID thread. A lot of insect experts on that thread.

You also should contact Colorado State U extension service to see if the could identify this issue for you. From the location and type of damage, it did not look like the work of atwig borer or a peachtree borer.

You have a good extension service. Hope they could help you figure it out.

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