The granary weevil has elongated punctures on the pronotum and is wingless. Adults chew into the grain kernels from the outside and also to lay eggs. Females can lay 300 to 400 eggs typically one per cavity. They may complete a generation in a month in warm conditions. Adults often live for 7 to 8 months and some records are over 2 years.
Mouthparts are for chewing.
Found in stored grains of all types including wheat, corn, oats, barley, sorghum, macaroni, and other grain products. They may also infest grain in the field. Larvae hollow out kernels of grain and usually attack whole kernels. Holes in the side of the grain are made by adults and by the emerging adults. They build up in numbers in stored grain.