The larva feeds internally on the seeds and then from a case, which consists of a seed capsule.

They feed internally in the stems of their host plant.

The larvae feed internally on the flowers and leaves of oak trees.

Young larvae feed internally in the stems or shoots.

The larvae feed internally on the stems of Calamagrostis species.

The larvae feed internally on the stems of Phragmites australis.

They feed internally on both flowers and berries.

The larvae feed internally in the acorns or nuts of the host plant.

The larvae feed internally in the stems of cereal crops.

They feed internally on cones, needles, twigs and under the bark of their host plant.