West Indian Sweetpotato Weevil

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Scientific Name: Euscepes postfasciatus  Fairmaire


Adult West Indian Sweetpotato Weevil.

Diagnostic summary

  • What they do to plants

- larvae and adults feed and tunnel into the stems and storage roots.


- damaged roots become bitter, emit terpene odour, and are not suitable for human or animal consumption.


- damage continues after harvest in stored roots.

  • What you see on  plants

- damage is characterized by small feeding and ovipositional punctures on the stem and storage root surface and larval tunnels filled with frass inside the stems and storage roots.  


- larval feeding causes thickening, drying and cracking of the stem.

  • Larval stage is the most destructive stage.

  • Hot, dry weather favours weevil development.

  • Found in the Americas and Japan.


Economic importance

Geographical distribution



Biology and ecology

Detection and inspection




View full fact sheet


Related pages:

Sweetpotato Weevil

Other weevils