I have a 15 year old log cabin in ohio and it is made of pine. I stained cabin and put insecticide for carpenter bees but they still are around. I went to the cabin this week and found a woodpecker severely damaged the logs getting at the larvae i guess the wholes are big can they be repaired or do i need to replace?
There is no insecticide additive that will work for Carpenter Bees. They do not digest the wood that they chew, but come back out and regurgitate it up so it will not work.
Most additives are a contact type insecticide and the logs must be kept clean for it to work. Unfortunately, it usually will not work as a contact killer on Carpenter Bees. The only way to slow them down is powder the hole with a Bee Kit. You’ll never get ride of them completely but diligence will keep most of them away.
As for the logs it depends on how badly they have been torn up. You could fill them with Wood Epox if the holes aren’t too large.
You can get a Bee Kit and the Wood Epox from Timeless Wood Care Products at 800-564-2987.