Kitchen and Pantry Pests

Grain Weevil

Grain Weevil
Tap to view larger image
Grain Weevils occur all over the world and are a common pest in many places. They can cause significant damage to harvested grains that are being stored and may drastically decrease yields. The females lay many eggs and the larvae eat the inside of the grain kernels. They are hard to detect and usually all of the grain in an infested storage facility must be destroyed

Adult wheat weevils are about 3-5mm length with elongate snouts and chewing mouthparts

Female wheat weevils 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.

They also lay their eggs in wheat, oats, rye, barley, rice, corn, and occasionally macaroni and spaghetti.