Last modified: Oct. 4, 2020, 10:08 a.m.
A locally common species in Belgium, most often recorded in Flanders, more rarely in Wallonia.
Head light brown, mixed with many white hairs; forewing ground colour golden brown with a white pattern consisting of a very broad basal line, edged with brown scales only on the upper side; sometimes a atch of white scales at the dorsum close to the base of the wing; four costal and three dorsal striae, finely edged with brown scales at the basal side; a spot of black scales in the apical area.
At first a round, but later long, tentiform mine on the underside of a leaf, most of the time in an axil of a secondary leaf, always situated between two secondary veins; underside with one central longitudinal fold. The underside of the mine is greenish at first, but later on it colours brownish.
See also gracillariidae.net and bladmineerders.be.
Especially in the autumn generation, many mines on one leaf. The species hibernates in the pupal stage, between leaf litter on the ground. After emergence of the adult, the pupal skin protrudes from the mine.
Two generations a year: April–May and August–September.