Common bean weevil

(Latin: Acanthoscelides obtectus)

This beetle mainly infests beans, but it may also occur in other related crops. It can lay eggs in fresh beans in the fields or in dried stored beans.

The female lays several eggs in each bean. When the larvae are fully grown they gnaw their way out towards the surface of the bean and pupate, leaving a thin shell between themselves and the outside world. When the adult beetles are ready to emerge they only have to break through the circular ‘windows’ to be free (see p. 93).