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Alder Tree Holes in Ring: Sapsucker Woodpecker, Not Harmful

Alder in Seattle has ¼-inch holes in a ring 15 ft up, with reddish sap.

Cause: Sapsucker Woodpecker

Bird drills holes → sap attracts insects → bird eats insects.
Does not harm tree.

If Deterrence Desired

Spray hole area with insecticide to kill insects; bird leaves when food gone.

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