Last modified: April 20, 2020, 11:19 a.m.
A common species in Belgium.
Forewing ground colour greyish with up to ten, sometimes rather inconspicuous, whitish striae at the costa; some dark brown dots in the center of the wing and near the inner margin. A certain identification of adults, without knowledge of the larval hostplant, is often impossible without reference to the genitalia.
The first instar starts its mine on the underside of the leaf as a small, narrow gallery. This gallery is often covered by the next instar which froms a blotch mine, mostly at the tip of one of the leaf segments. Wherever the caterpillars consume the plant tissue, the mine turns brown, at first just some small brown spots, but later on the entire mine.
See also gracillariidae.net and bladmineerders.be.
Later instars deposit their frass as small blackish grains inside the mine. Free living stages spin a downwards turned leaf segment in to a fold or cone under which they live and of which thay also consume the entire palissade parenchyma, causing the fold to turn brown. Two successive cones are constructed.
Pupation in that folded leaf edge or on leaf litter.
Adults hide during the day, but become active at dusk and at night. They come to light.
The adults fly in two generations a year: during April and May and again during August.
Garden or road borders with Crataegus, forests with individual Crataegus bushes.