A weevil is a type of beetle that feed on plants, especially grains. Weevil larvae are often found in packaged flours, cornmeals, cereals, and even dog food. These larvae don’t make their way into the sealed food packages; they were already in the food as eggs before the packaging process. Although weevils do no harm to humans or animals, even when ingested, they are a headache to food producers. Weevil infestation, which can occur any time of the season, can retard the growth of crops or kill off the plant completely.