sealing carpenter bee holes with caulking

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.

Carpenter bee holes should be sealed with a cork or wood dowel. The key is using something that seals the hole tight but keeps all the space inside open. This will allow hatching larvae to move about and pick up a lethal dose of the treatment. Since they won't be able to walk or chew through caulking or expanding foam, by filling up all the treated areas you could force them to forage into new untouched wood thus allowing them to prosper elsewhere. In other words, this is not a good idea.

Not sure about the "holes that are sealed"; carpenter bees will lay eggs and seal them up with food but again, if voids of the main nest are left open, the treatment with Drione or Pyganic will get them when they hatch since this dust lasts a long time (which is why it's the only dust to use for this treatment

Not sure about any wasps that might be hanging around either except that they might be looking to start their own nest like they are here at my house. Use the same Drione and Cypermethrin to stop them as discussed in our Wasp Control article. I don't know if any wasps that feed on carpenter bees and even if they did, it will be a long time before the eggs will be hatching so they're in for a long wait if that's why  they're hanging around. My guess is they're really just looking to make new nests in the same area and are a separate problem altogether.