Last modified: Feb. 19, 2021, 2:54 p.m.
A rather common species in Belgium.
Grey-brown to greenish cocoon.
The larva makes a leafmine usually on the foodplants. Usually a very long sinuous gallery with broken linear frass or if dispersed only one third of mine width.
The larvae of September-October are more numerous, so it's possible that there is only one generation with a minority of individuals emerging and reproducing ahead of the rest.
The adults fly probably in two generations a year: late April-May and July-August.