Which of the following types of beetles is known to infest hardwood lumber?

The True Powderpost beetle is known for its ability to infest hardwood lumber. This type of beetle primarily targets seasoned hardwoods, particularly in items such as furniture and flooring. Its larvae feed on the wood, creating extensive damage over time as they tunnel through. The term "powderpost" refers to the fine, powdery frass that can be left behind once the larvae have completed their development and exited the wood.

Other beetles listed also infest wood, but they have different preferences or behaviors. For instance, the Deathwatch beetle primarily affects seasoned hardwoods as well but is less common and is better known for infesting old timber. The False Powderpost beetle, despite sharing a similar name, often infests both hardwoods and softwoods and is generally seen as less of a structural threat compared to the True Powderpost beetle. Old House Borers typically infest larger wood structures but are more associated with softwoods, making them less relevant for hardwood lumber specifically. Thus, the distinctive wood preferences and behaviors of the True Powderpost beetle clarify its role as a significant pest of hardwood lumber.