Last modified: April 23, 2020, 6:18 p.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 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.