Wingspan 11-15 mm.
The conspicuous yellow blotch identifies this colourful moth when at rest, and it can often be seen flying during the day around its main foodplant, ash (Fraxinus). The larvae also feed on privet (Ligustrum).
Flying during May to July, it is quite common through most of Britain.
With a wingspan of approx. 13mm, it is one of the smaller Tortricidae.