Last modified: Sept. 6, 2019, 12:08 p.m.
A common species in Belgium.
The egg is deposited on the underside af the leaf.
Mines of Ectoedemia atricollis are variable. It starts as a contorted gallery when the egg is laid away from the leafmargin. When close to the margin the gallery follows the margin for a while in the meanwhile the gallery widens into a elongated large blotch, the black frass is dispersed.
See also bladmineerders.be
It pupates in a black cocoon spun on or just below the soil surface.
The adults fly in one generation a year during June.