Last modified: Oct. 9, 2020, 10:54 a.m.
A fairly common species in Belgium though spread all over the country.
At first a long gallery leading to a blotch on the leaves. The blotches when fresh are yellowish in colour, but they bleach rapidly after the larvae have vacated them.
See also bladmineerders.be
The caterpillar starts its life as a leaf miner. Pupation in a cocoon amongst detritus on the ground.
Two generations a year: May–June, and again in late July and August.
Waste ground, ruderal places, clearings in woods.