Grau-Erle
The larvae feed on "Alnus glutinosa", "Alnus incana", "Alnus viridis", "Betula pubescens", "Betula pendula", "Carpinus betulus" and "Corylus avellana". They live in a composite leaf case composed of large leaf fragments. In spring, the case has two colours, consisting of dull yellowish and grey or pink old material dating from before hibernation and reddish brown new material.