What characterizes the exit holes created by true powder post beetles?

The characteristics of exit holes made by true powder post beetles are indeed small and round. This specificity in size and shape is crucial for identification and differentiation from exit holes made by other types of wood-boring insects. True powder post beetles typically produce these tiny, circular holes as they emerge from the wood after completing their larval stage.

The small size of the exit holes indicates the narrow body of the adult beetle, which is essential for confirming the type of pest infestation present in wooden structures. Understanding these characteristics allows pest control professionals to identify infestations and choose appropriate treatment methods.

The other options do not correctly describe the typical exit holes of true powder post beetles, as they either suggest larger or irregular shapes or imply that they would have additional markings or substances, which is not the case with this specific insect.