Flatterulme
The larvae feed on "Ulmus glabra", "Ulmus laevis", "Ulmus minor" and "Ulmus pumila". They mine the leaves of their host plant. The mine consists of a slender corridor. In the first segment, the frass is concentrated in a narrow central line. The frass pattern in the later segment is very variable, ranging from a narrow central line to broadly dispersed or even coiled.