[duckman1911]

Originally Posted by Duckaholic

They feed it to their larvae. Have you ever sprayed a carpenter bee in their hole? They are the worst. Their holes are full of gobs of yellow pollen that the larvae feed on while growing.

http://ento.psu.edu/extension/factsheets/carpenter-bees

Interesting. Thanks. I have sprayed a bunch of them in their holes but have never inspected their hives. I just fill the hole with a good spray of carb cleaner and watch them bail out. When they hit the concrete a work boot does the rest.