Hi Dennis,
There's a product called "Term-out" that comes in a spray can, and it has a little hose with a needle so you can shoot it into the holes... There's a similar product called "Time out for termites", and it has the same hose/needle, but I think Term-out is stronger.
I've used it many times, and it does work, but it's nearly impossible to treat every single tunnel. Fumigation, or replacing the whole post, is the only way to be sure you got all of them.
I looked close at the pictures, and I think I see a lot more "pinholes" in that 4X4. If you try to treat it yourself, it'll get very tedious trying to hit every single tunnel. And, you'll never be sure if you got them all.
How hard would it be to replace that post? Since you would be able to do it yourself, it might be cheaper than fumigating. The advantage of replacing it, is that you'll be able to see if they moved into other pieces too. Also, when future generations come around looking for a new home, they won't be able to just move in as easily.
I'm not exactly sure that the Term-Out will kill powder post beetles, but I'm guessing it would. I only dealt with powder post beetles once. They were in a bed frame, so I wound up taking it to a place where they put it inside a container to fumigate.
Sometimes they use heat to kill infestations too.. iirc, about 130-140 degrees, for 24 hours, would work too. But again, I'm not sure about those beetles.
Good luck to ya Dennis, cheers,
Jim
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