Dear mike,

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YOUR QUESTION #0003972:

Willow Oak Tree Issue

I have a very old willow oak tree on 12th and T St NW. As I was pruning some small branches, I discovered these odd bubbly growths on what otherwise appears to be healthy wood. The inside of the growths has a sponge-like consistency and ranges in color from white to dark brown. Do you have any thoughts of what they are? Is there something I should do about them? Thanks, Mike

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