Sitophilus granarius

Definition

A cosmopolitan pest weevil (Coleoptera: Curculionidae) specializing on stored cereal grains; the most cold-tolerant Sitophilus species and a primary pest of wheat, barley, and rye in granaries worldwide. Adults are flightless, apterous, and distinguished from congeners by the pronotal punctures that are nearly circular and separated by flat intervals; larvae develop entirely within single grain kernels, producing characteristic exit holes at emergence.

Etymology

Sitophilus, from Greek sitos (grain, food) + philos (loving); granarius, Latin for of or belonging to a granary

Example

In grain-storage facilities, Sitophilus granarius populations are monitored by probe traps or by sieving grain samples to detect adults, while larval infestations are assessed by X-ray imaging of kernels to reveal internal feeding galleries before adults emerge.

Synonyms

• Granary weevil
• grain weevil
• wheat weevil

Related Terms

• Sitophilus oryzae
• Sitophilus zeamais
• stored-product entomology
• primary grain pest
• kernel damage
• Integrated Pest Management
• Curculionidae

Usage Notes

Distinguished from the rice weevil (S. oryzae) and maize weevil (S. zeamais) by its flightless, apterous condition and more rounded, less oval body form; the latter two species possess functional wings and elytral humeri. In cooler temperate regions, S. granarius often predominates over congeners in unheated storage. The common name "wheat weevil" is shared with several taxa and is best avoided in technical contexts.