Prevention of Carpenter Bees
You can prevent Carpenter Bees from drilling those holes in the exterior of your homes if you spray a residual insecticide on the exterior surfaces before they start nesting activity.
We suggest FenvaStar EcoCap, LamdbaStar UltraCap 9.7 CS, or Cyper WSP Insecticides. Spray on the areas that are vulnerable to Carpenter Bee holes. Usually, these vulnerable areas are unpainted or unvarnished woods. Popular drilling choices for carpenter bees include under siding, under deck rails, under eaves, window frames, etc.
Spray a couple of times at intervals of a month apart during the spring and early summer season.