A friend has a wooden swing and carpenter bees are flying around it. What can they spray to kill the bees and if nests in the wood to get rid of the eggs also?
Unless they’re doing serious damages to the wood, I let them bee. The male doesn’t have a stinger and can’t sting you, and the female is not aggressive and usually won’t sting unless you tried to pick her up. Plus, she can be a good pollinator. But if they are causing structural damages in the wood or ‘beeing’ a real nuisance, a simple swat with a tennis racket takes care of them. And you can run a wire into the hole in the wood and kill any bee in the hole as well as the larvae. If sprays are needed, try dusting the opening of the hole with an insecticide listed for wasp/ bees. But do that as a last resort. By the way, using ‘Liquid Nail’ has been found to be the best filler for carpenter bee holes. Larvae / adult bees in the holes cannot chew threw the filler and get out of the hole / or back in.