Which items can lesser grain beetles bore into?

The lesser grain beetle, scientifically known as Rhizopertha dominica, primarily infests stored grains and other dry plant materials, but it can also damage materials that are made from or contain organic matter. This includes items like books, which are often made from paper, and wood, as both are susceptible to infestation by this species.

The beetle is not equipped to bore into harder, non-organic materials, which limits its potential to damage items such as plastic, metal, glass, concrete, and stone. These options are composed of materials that are too dense or lack the necessary organic component that the lesser grain beetle requires for sustenance and reproduction. Therefore, the focus of the lesser grain beetle's activity is on biodegradable goods, making the option involving books and wood the relevant choice.