An adult rice weevil can live for up to six months, and a weevil's lifetime from egg to adult can last up to 45 days. A female weevil can produce as many as 300 eggs in that time. A weevil perforates rice seeds or kernels, then seals them with a secretion. Her weevil larvae eat from the inside out, leaving only a husk.
The grain weevil (also known as a wheat weevil) has nearly as long a lifespan. In short, the weevil larvae can destroy grains as they grow, mate, and lay their own eggs while safely inside a sealed bag of grains.