Looking at the round hole, the tree probably had beetle larvae (borers) under the bark which is what the woodpecker was after. I've also seen similar damage done by grey squirrels.
A trowel in the hand is worth a thousand lost under a bush.
I've noticed similar damage on one of my immature crab apples this year. Only about a 4' from the ground which made me wonder if I'd accidentally damaged it with tools - but really think I'd have noticed doing it!
We have both woodpeckers and squirrels here so your suggestions make sense - thank you.
Is the damage a threat to the health of the tree?
Heaven is ... sitting in the garden with a G&T and a cat while watching the sun go down
In the case of the tree in the photo, the bark has been pretty much 'ringed' and all parts of the tree above the damage will die. However, if there is still a connection between the bark below and above the damage, there's a fair chance the tree will expand the damaged bark to close over the wounds but that will take several years.
A trowel in the hand is worth a thousand lost under a bush.
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We have both woodpeckers and squirrels here so your suggestions make sense - thank you.
Is the damage a threat to the health of the tree?