Photo by H. A. Turney. Larvae are legless, white and rotund with a distinct head capsule. 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.