They may be found in stored grains where they feed on debris or dead insects and damage grain. Their main impact, however, is on grain value. Their presence in grain can result in rejection of the grain by grain buyers. When insects are present in a grain bin, other problems such as high moisture and molding are usually affecting grain quality. Proper bin sanitation before introduction of new grain minimizes the need for pesticides.
Good sanitation involves the removal of old grain and dust in and around the grain bin.
This includes removal of old grain from corners, floors, and walls. Any grain remaining when a bin is emptied can harbor insect infestations which will move into the new grain. Grain that is to be stored for longer than six months may need a protective application of an approved insecticide. Grain placed in a clean bin should be checked at two week intervals during warm months and at one month intervals during cooler months for the presence of hotspots, moldy areas, and live insects. If any of these conditions exist, the grain should be aerated to lower the moisture level and temperature.