Last modified: Jan. 22, 2021, 2:14 p.m.
A common species throughout Belgium, known from all provinces, but numbers vary considerably between years.
A white, elongated blotch mine, continuously enlarged. The inside of the mine is lined with spinning, causing the mine to contract slightly. Frass is ejected through a small whole at the underside of a leaf. The mine of this species could be confused with that of the very rare Coptotriche heinemanni, also occurring on Rubus, but the mine of that species if yellowish-brown.
See also bladmineerders.be
No cocoon is formed.
The eggs are oviposited on the upperside of a leaf.
The species hibernates in the larval stage, inside the mine, without making a cocoon, and still feeding during winter whenever the temperature is not too low. Pupation in early spring.
The adults fly in two generations a year: May–June and August.
Forest edges, clearings in forests, preferable in the shade of trees.