The larvae feed on Ledum palustre, Ledum groenlandicum and Chamaedaphne calyculata. They create a strongly curved lobe case. Some very large leaf fragments are found in the central part. Young larvae overwinter in small cases. When feeding and larval growth are resumed in early spring, the larvae enlarge their cases by adding a series of rings of leaf epidermis with pieces sticking out on all sides. They make underside mines that are easily detected as large brown blotches visible from the upper surface of the leaves. The larvae mature in late April and early May feeding on the previous year's foliage. The adults emerge in early to mid-May and are possibly diurnal.