This is one of the smallest of the grain-infesting beetles, but one of the most important. Originally native to the tropics, it has spread through commerce to all parts of the world. It is most prominent in the United States, southern Canada, Argentina, India, and Australia. In the United States, it is particularly widespread in the Gulf states. Both adults and larvae feed within the interiors of nearly all grains, including rice, and the kernels are reduced to mere shells, hence it is a hidden infestation until the adults are apparent.

Description:
The adult is about 3 mm long, polished dark brown or black, and has a somewhat roughened surface. In common with other bostrichids, which are principally woodborers, Rhyzopertha dominica is almost cylindrical, and the head is vertically deflexed under the thorax so that it cannot be seen from above. Likewise, this insect, though small, has powerful jaws with which it can bore directly into wood . Wood may have been its original food. It can eat its way into wooden and paper boxes, and may destroy book bindings.

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