Two questions: first, do borer ( carpenter ) bees pollinate anything? Secondly, how can I get rid of them?
These are huge bees!! They make perfectly round holes with plenty of sawdust. I watched one go inside a hole and squirted Clorox cleanup in it. Hopefully it got the booger!
As for getting rid of them, here is one option:
http://www.hometalk.com/154411/carpenter-bee...
They are like little army tanks. Unless you swquish them under your shoes, you cannot kill them even with fly swatter, as they hit the ground and get up and fly away. At least they don't sting. What you aree seeing are the males. The queen, which can sting stays in the hole and lets the males feed her the polen so she can lay eggs for nest spring. I bought a butterfly net and catch them and very quickly bring to the ground and squish them under my shoes. My batting average this year is 167 killings. Then I used the steel wool and no more around my condo. They are eating my neighbors wood.
When my steel wool deteriorates, I'll try the Demon WP. If that does not work, I getting metal flashing.