Flatterulme
The larvae feed on "Ulmus glabra", "Ulmus laevis", "Ulmus minor" and "Ulmus pumila". They mine the leaves of their host plant. They create a short, roundish to oval, somewhat inflated, lower surface tentiform mine, often crossing a lateral vein. The epidermis has several lengthwise folds. Pupation takes place in a tough, greenish cocoon which lies freely in the mine.