An essentially southern species which is rare in the north of England, this is another species where the adults require dissection for identification. It is however much easier to confirm in its early stages and the distinctive cases formed from empty seed heads can be found attached to other seed heads of the foodplant during the autumn. Distinctive small round holes made by the larvae as they move from one seed head to another can also be seen in autumn and right through the winter. Our only record is of several of these distinctive larval holes discovered on the foodplant by the harbour in Hartlepool on 13th September 2022.