THANK YOU for the great info on these cute but annoying creatures who have infested my porch beams…..will spraying insulating foam sealant into the holes do the job of caulking or corks? If so, that would sort of reinforce the holes as well as trap the bees after spraying.  What should I do about the holes the bee has already sealed?  I assume the wasps loitering around are trying to get to the newly laid eggs at this time of the year and are establishing nests to be near to take advantage of the hatching bees in the fall.

More on sealing carpenter bee holes with caulking