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Typically, carpenter bees do not cause serious structural damage to wood unless large numbers of bees are allowed to drill many tunnels over successive years. The bees often eliminate their wastes before entering the tunnel. Yellowish-brown staining from voided fecal matter may be visible on the wood
beneath the hole as seen in the picture above. Woodpeckers may damage infested wood in search of
bee larvae in the tunnels. In the case of thin wood, such as siding, this damage can be severe. Holes on exposed surfaces may lead to damage by wood-decaying fungi or attack by other insects, such as
carpenter ants.