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Identifying a potentially concerning American elm infection

6 years ago

I believe they are American elms. Most of my elm trees are showing a yellow/gray bark sponginess spreading downward from cut branches. Some are darker than others. Only a few of them are actively oozing any liquid from cuts. Any idea what this may be, how concerned I should be, and what, if anything, I can do about it? The images are three different infection sites on three separate trees.

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