Carpenter bees can be a difficult problem, and once they have found the spot for their galleries the bee game is on. The best way to treat for them is by being proactive and treating the areas of interest in early spring. Carpenter bees do not eat the wood so flavor of wood is not a concern, but soft woods such as cedar and redwoods are much easier for them to chew into.
Carpenter bees somewhat resemble bumble bees, but they will have different types of nest. Carpenter bees being found around wooden fences, patios, doors, eaves, wood shingles, window frames, and log cabins. When the female establishes a nest she will bore into the wood at a right angle. Saw dust created from the characteristic clean out with an opening approximately ½ inch wide.
Exterior surfaces that are coated with paint or varnish can be potential barriers to the bees as it will be more work for them to chew thru extra surfaces. But of course long term they are not 100% and will break down over time and you will find yourself with carpenter bees thinking the eaves and siding will be an exciting home for their family.
We recommend using Demand CS on the surface area that are seeming attractive to carpenter bees. Demand CS is a microencapsulated pyrethroid, and we have good feedback over the years when using it with carpenter bees. If you already have an established entrance you may want to also add Delta Dust to the gallery. Wait until you see no more movement of bees in the opening then you can fill it with wood filler to prevent a new infestation.
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