Metallic blue or black buzzing bees fly around the home and yard. They may be seen entering and leaving holes about 1 inch wide in decks, posts, beams, rafters, and other wooden structures. When damaged wood is sliced open, partitioned galleries may be seen. The partitions may contain immature bees.
Although they are frightening because of their loud buzzing and large size, male bees do not sting, and females sting only when handled. Paint wood surfaces once a year to discourage bee tunneling. Close the holes with putty, caulking compound, dowel pins, or plastic wood to prevent bees from returning to the nest.