Prognosis on Bracket/Shelf Fungus?

Question

This is a fairly recent (last few weeks) development:
https://www.dropbox.com/s/t2luwy7cuuss1c7/2020-07-18%2014.17.19.jpg
https://www.dropbox.com/s/pcj9g72eh5sh7ig/2020-07-18%2014.17.24.jpg
It appears to be a bracket/shelf fungus:
https://laidbackgardener.blog/2018/11/19/what-to-do-about-bracket-fungi/
From the link, it appears this has already been at work inside the tree for a while?  You can see two trunks coming out of a common root area; there used to be three (the third trunk came down in a wind mmm...8? years ago).  There were some of these shelf fungus eruptions on (I think this same trunk) about 5 years back, but not since.
What's the prognosis...anything that can be done to either slow or halt the intenral issues?

Bamboo · Answer

It is a bracket fungus, and it spells the death of your tree. That can take some time, but you say you noticed the fungus on the other trunk that broke during a wind, which  means this has been going on for some time. As you've observed, the rot takes place inside  the tree, and the bracket fungus appears some time later, as it progresses. There is nothing you  can do to stop the fungus and decay, so the same will eventually happen with the rest of the tree. I suggest you have it removed rather than wait for it to fall on a person or a structure. Call an arborist (or tree surgeon) to confirm this/do the work.
UPDATE: There is no treatment available I'm afraid, more information here https://www.rhs.org.uk/advice/profile?pid=98

Prognosis on Bracket/Shelf Fungus?

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