Erica tetralix
The larvae feed on heather ("Calluna vulgaris"), tree heath ("Erica arborea"), bell heather ("Erica cinerea"), "Erica manipuliflora" and crossed-leaf heath ("Erica tetralix"). They create a shining black, bivalved sheath case of about 9 mm long with a mouth angle of about 20°. Full-grown larvae can be found in mid May. The pupa is formed in the larval case, which is attached to the tip of a shoot.