I have had battles with carpenter bees for years.Would manage to kill a few and constantly had holes bored in rafters with bee sawdust dropped down into my boat.Would use silicone sealant in their holes at night to furnish them an early grave.While looking through farm n garden on craig's list found an ad for carpenter bee traps.

There are lots of trap plans online

Basically you build a wooden box and attach a pint or quart jar to the bottom.There are holes in the sides and bottom of the box going to the jar.Bee goes in the hole in the box.sees light in the bottom,goes into jar and cannot get out.



You tube has carpenter trap videos

Good Luck