On the subject of Wheat weevils...
Female wheat weevils can lay between 36 and 254 eggs and usually one egg is deposited in each grain kernel. All larval stages and the pupal stage occur within the grain. The larvae feed inside the grain until pupation, after which they bore a hole out of the grain and emerge. They are rarely seen outside of the grain kernel. The life cycle takes about 5 weeks in the summer, but may take up to 20 weeks in cooler temperatures. Adults can live for up to 8 months after emerging.
Sanitation and inspection are the keys to prevent the infestation. Store grains in containers with tight lids in a refrigerator or a freezer and purchase in small quantities. If any suspicion has arisen, carefully examine the grains for adult insects or holes in the grain kernels. Another method is to immerse them in water. If they float to the surface, it is a good indication of infestation. Even if identified early, disposal may be the only effective solution.