[Paul R.]

Well, thanks for the replies, but if I go after every source of stinging insects around here by hiring a pro, I'd (we'd) be financially wiped out. Not that that would take a lot of spending... :-(

So, I did further research. (Diana will laugh.)

It turns out all sorts of things will drive wood bees off, and maybe the easiest for me is loud bass sounds (vibrations). I'll have to hunt for them, but, somewhere I have a couple of these:

https://www.parts-express.com/Dayton-Audio-BST-1-High-Power-Pro-Tactile-Bass-Shaker-50-Watts-295-244?quantity=1

The beauty here is that I can "apply" one of these to the top of the wellhouse roof and hold it in place with a little rope and a couple bungee cords, also keeping a cheap blue tarp over the shaker to ward off rain.

If that doesn't work, I really CAN pipe in car exhaust from outside, without risking getting stung. And having pondered it a bit more, Dad had some insecticidal smoke bombs "somewhere", too...

[Paul R.]

More traditional solutions (not all apply in my case):

https://www.homedepot.com/c/ab/how-to-get-rid-of-carpenter-bees/9ba683603be9fa5395fab90feb70005

[metmom]

Do it on colder weather or the coolest time of day as well.

Cold stuns stinging insects.