The most telling signs of carpenter bee infestation are the presence of half-inch round holes in dry, unfinished wood, with piles of sawdust underneath. Also look for dirty yellow streaks of fecal matter staining the wood below the hole. If a given hole is presently occupied, you will likely find the male buzzing around you when you are near that hole. A single pair of carpenter bees occupies each nesting hole, with the female boring galleries and the male standing guard outside. Carpenter bees tend to target the same nesting sites year after year. Because carpenter bees tend to target the same nesting sites year after year, integrated pest management is the ideal way to locate, destroy and prevent further infestations.