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Spray a residual insecticide in the areas where the bees are active. I recommend the insecticides: Cyzmic CS, Demon WP & FenvaStar EcoCap.
While not the cheapest, Amazon conveniently carries all of them.
I actually purchased Cyzmic CS earlier this week and sprayed the deck and rafters of the deck yesterday.
This afternoon the wife sends me a text that there are four carpenter bees hovering and two trying to dig into the just sprayed wood. I even went a bit heavy on the mix - 1oz of Cyzmic to 1 gallon of water in my sprayer.
Now I'm going to try the trap method. Figured one way or another these guys are going to die.