Grain Weevil

Sitophilus granarius

Appearance

•  Adult - 2 - 3mm in length. Oval indentations in thorax. Black-brown colour. Cannot fly (fused elytra). Rostrum (snout).
•  Larva - usually hidden within grain where it pupates. Legless. Prefers wheat and rye but will infest other cereals.

Lifecycle

•  30 days at 30°C. Normally 8–16 weeks. Can develop at 11°C.

Habits

•  A pest of grain. Newly emerged adults leave a characteristic emergence hole in the grain.