The exit-hole is located on the leaf underside and has the form of a crescentic hole.

The leaf undersides are whitish, and covered in a fine fur.

Older larvae live free and cause window feeding, usually at the leaf underside.

Purple spots may also appear on the leaf undersides.

The egg is laid on the leaf underside, amongst the thick tomentum.

Older larvae live freely at the leaf underside, under a frass-covered web.

A female deposits her eggs together on bark or on a leaf underside.

It has hairy new branchlets and pale brown leaf undersides.

Part of this frass is captured in spinning at the leaf underside.

The Larvae are found at the leaf underside.