Granary weevils are tiny insects that reach only about 1/8 inch long.
They are dark brownish black in color and have a long snout that extends from the front of the head. This snout has a pair of chewing mandibles at the tip. The antennae are distinctly bent and arise from in front of the eyes.
Granary weevils are usually found in grain storage facilities or processing plants where they infest wheat, oats, rye, barley, rice, and corn. They are sometimes found in homes and can infest table beans, acorns, chestnuts, birdseed, sunflower seeds, and ornamental corn.
The granary weevil uses its chewing mandibles to feed on all kinds of grain including corn, wheat and rice.
The female granary weevil lays around 200 eggs and places them one at a time into a small hole she bores into each grain kernel. She covers each hole with a film of gelatinous secretion to seal a single egg inside each kernel. It is difficult to detect infestations at this time because they cannot be seen. Larval development lasts about one month and adult granary weevils bore a ragged hole in the grain and emerge to live about eight months. There may be as many as four generations each year if conditions are favorable.
When disturbed, the granary weevil will feign death by drawing its legs close to the body, falling, and remaining silent.
The most important step when dealing with any stored food pest is removal of any infested food. This may include unopened items in some cases.