Which group of wood-boring beetles is commonly found in rustic structures and manufactured products?

The correct answer is the group commonly referred to as powderpost beetles. These beetles are known for their ability to infest both rustic structures, such as old wooden barns or homes, and manufactured wood products, like furniture and flooring. Powderpost beetles are particularly noted for creating small holes in wood as they bore through it, leaving behind fine, powdery frass, which is a telltale sign of their presence.

In rustic settings, the likelihood of wood being less treated or of poorer quality makes it more susceptible to infestations. In manufactured products, these beetles can pose significant problems because they can compromise the structural integrity and aesthetic value of the items affected. Their life cycle allows them to thrive in various types of wood, making them quite adaptable to different environments.

Other groups, while also wood-boring, tend to have different habitat preferences or feeding habits, and they're not as well-documented in rustic and manufactured settings as powderpost beetles.