A to Z of Pests

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.