Although carpenter bees pollinate plants like other bees, they are considered a nuisance. Rather than building a hive, carpenter bees bore into wood and nest in the holes. Wood siding, fence posts and garden furniture is a potential home to the large bees. If you notice black bees with an iridescent hue coming in and out of holes in your home, you should get rid of them before they cause structural damage. You don't need to use harmful chemicals, just a few household items and some special paint will help you get rid of carpenter bees.
Look for half-inch holes in wood siding, the ends of fence beams and posts, play structures or other wooden garden furniture.
Cover the holes with a piece of screen. Use duct tape to hold the screen in place. Leave the screen for at least two weeks.
Remove the duct tape and screen. Smear wood putty over the hole. Build up the putty until the hole is filled.
Paint over the areas you sealed with the wood putty. Allow the paint to dry.
Mix the NBS 30 into one or five gallons of water (depending on the amount of NBS you purchased). Stir well and apply the mixture onto any wood siding or structures in your yard with a clean paintbrush.
Allow the first coat to dry. Apply a second coat of the mixture.