Elm leaf beetles may be found during the summer months; however, both the adult box elder bug and elm leaf beetle will accumulate in large numbers inside the structure during the fall and will hibernate in wall voids or attics.
These insects can damage many natural fibers (i.e. cotton and wool) and will also feed on any protein source (i.e. dead insects and rodents, fur, feathers, pet hair, as well as some stored products).
Merchant grain beetles are typically not found in grain products, but instead like to attack cereals, cake mixes, macaroni, cookies and chocolate.
Powderpost beetles have long, narrow, flat bodies that allow them to easily attack wood surfaces. They often attack hardwoods, and can be found in hardwood floors, timbers and crates, antiques and other objects made of hardwood materials.