Quote:
Originally Posted by
why 
The only bees that survive the winter should be the queens, so it might be easiest to remove them during the colder months.
No, the queens are not the only bees to survive the winter. The queen would die without the hive. Male and female carpenters over-winter. (We're beekeepers).
Furo- if your pest control is only spraying, it's not helping. They'll be back soon.
Each hole needs to be injected with delta or cyper... unfortunately they are mostly repellents with a 1-month effectiveness. What really needs to happen is the holes need to be treated and then pegged or dowelled. Not as hard as it may seem (depending on how many holes you have; their tunnel is perfectly round and pretty consistently sized around 1/4". By the way- June was about the best time to treat.
And seriously- you should then paint over
any exposed wood, even if that means your entire crawlspace or attic. A thick coat of glossy may be best, the bees don't understand paint and don't see it as wood. Do paint- otherwise they'll be back and tunnelling... and they are
very good at tunnelling. In limited applications, fine wire screen might deter them too. Have you figured out where they are getting in?
The upside is that they are fairly solitary so the colony won't be too large. The males are aggressive but yay for us, they don't have stingers. You have to try pretty hard to get a female to sting.