Last modified: Jan. 22, 2021, 2:25 p.m.
A common species throughout Belgium.
Yellow, with brown head capsule and greyish brown last abdominal segment.
A large, white mine on the upperside of a leaf; occasionally several mines can be found on one leaf. At the end of the development a semi-circular pupation chamber is constructed, which is visible because of the white spinning. Frass is ejected from the mine through a hole in the upper cuticula.
See also bladmineerders.be
A semi-circular pupation chamber lined with a lot of white silk inside. Pupa brown.
The egg is oviposited on the upperside of a leaf, sometimes several eggs on one leaf.
Already the earlier instars start to construct a semi-circular pupation chamber in the larval feeding place. This pupation chamber is lined with white spinning and therefore visible as a white circular spot with a light ochreous hue in the centre, in the otherwise whitish mine. The caterpillar often rests inside this pupation chamber between its feeding activity. It then lays in a bend position which can easily be observed when one holds the mine towards a light source. The species hibernates in the pupal stage.
The moths come to light.
The adults fly in May and June. During favourable years, a second generation develops of which the moths are on the wing in August.