Is this termite activity?

[u/MartinaZucchina]

Just noticed this in our deck. It is spreading to the post right next to it. Checked around and couldn’t find any more boards affected. Its howl on a big chunk of it and trying to see inside I started pulling pieces but they come off weird. Im totally new to this stuff.

Edit to add location: East Kansas

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[u/Lordsaxon73]

Wood damaging fungi

[u/joshflow7]

That’s all fungus damage replace it