rather rare species in Belgium, but probably overlooked in many places.
larva lives at first in a narrow gallery filled with frass of Cornus
mas, also Cornus sanguinea. Later on the gallery suddenly widenes to a
blotch-mine. The larva constructs an oval case of 4-4.5 mm cut from the
blotch, in which it drops to the ground. The larva hibernates in that
case on or just below the surface of the soil and pupates in the next
adults fly in May and June and again in August. The moths are active in sunshine.
Oost-Vlaanderen, Nazareth, 01 August 2007.
imago reared, mine found on 15 July
(Photo © Chris Snyers)