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I have an English walnut that is approx. 5-6 years old. There is a White fungus growing in the collar from a branch I removed. Is it harmful or caused by moisture? The tree is 20 feet tall and is bearing nuts. In the state of Wisconsin.

Tree showing white fungus where branch removed

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  • Are you sure that tree is only 5 years old? Boric acid (aka bug powder) is a cheap and extremely potent anti-fungal agent that won't hurt the tree; just give it a poof or two as needed.
    – dandavis
    Jul 19, 2021 at 23:17

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I would put bleach on it to kill the fungus. A few applications would be good . If fungus gets into the trunk the tree will slowly die.

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