Coffee bean weevil

Taxonomic position: The coffee bean weevil (Araecerus fasciculatus) belongs to the order Coleoptera and the family Anthribidae. It is widely recognized as a serious cosmopolitan pest that predominantly affects tropical and subtropical commodities during storage and transportation.

Crops attacked: This insect is highly polyphagous, meaning it has a vast host range. It infests raw coffee beans, cocoa beans, corn, peanuts, dried fruits, spices (such as nutmeg and ginger), and various oilseeds. It can also colonize decaying plant material in the field before harvest.

Biology and life cycle: The life cycle is typically completed within the host commodity. The female drills a hole into the seed to deposit her eggs. Once hatched, the larvae feed internally on the seed's nutrients. The insect prefers warm and humid environments, which allow for continuous generations throughout the year in controlled storage settings.

Damage and severity: Infestation is marked by small circular emergence holes on the surface of the beans. Internally, larvae consume the endosperm, significantly reducing the weight and quality of the stored goods. Infested products often become contaminated with frass and may develop secondary fungal infections, making the batch commercially unusable.

Protection measures: Management strategies focus on sanitation and preventative logistics.

• Regular inspection of warehouse stocks and storage areas.
• Application of cold or heat treatment to infested batches.
• Fumigation of grain silos using approved gas treatments.
• Implementing strict inventory rotation and moisture control to deter colonization.