Grain Weevil

Sitophilus granarius

Appearance

Image of Grain weevil (Sitophilus granarius) | Rentokil Singapore
  • 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.