Four Spotted Bean Weevil

Bruchus quadrimaculatus

Appearance

•  Adult 4mm long.
•  Stout - bodied, shortened wing covers and a short broad snout.

Lifecycle

•  The female lays eggs into stored beans or into seed pods in the field.
•  When fully grown, the larvae form pupae in the eaten-out cavity of the bean.
•  Young adults chew their way out of the beans, mate, lay eggs and begin a new generation.
•  As many as six generations are produced in a single year.

Habits

•  The adults attack legumes either in storage or in the field and may completely destroy them.
•  Breeding continues in stored products as long as the products maintain their nutritional value and the storage environment is warm.