Last modified: March 6, 2021, 10:53 a.m.
A very rare species in Belgium, hitherto only known from WV, first recorded in 2017. In some cities like Brugge the species is not rare (see Meert R. 2019b).
At first, a short gallery soon widening into an irregular blotch. The species prefers plants that grow in shaded areas. The blotches are very transparant and the larvae well-seen. When several leaves are mined, the infestation can be noticed from a distance.
See also bladmineerders.be
Later instars of the larva spin a part of the mine together into a hiding shelter or a place to rest between feeding periods. Pupation inside the mine.
Perhaps two or three generations a year, difficult to separate.
Monophagous on Parietaria spec.