Cornus mas
The larvae feed on "Cornus alba", "Cornus mas" and "Cornus sanguinea". They mine the leaves of their host plant. The mine starts as a short corridor close to the leaf margin. It later widens into a large blotch, that often overruns the initial corridor. Full-grown larva make an oval excision in which they drop the ground. They continue feeding from within this excision which is now used as a case. Pupation takes place within the case. Larvae can be found from July to August.