Leaf-mine: Blotch mine. Pupation external.

The mine mine begins as a long, hairlike corridor. The last part of it runs perpendicular to a leaf segment. The part of the leaf that thereby is cut off Wiltshire, and here a large blotch is made. Frass scattered in the mine. Mine practically full-depth, yellowish green to reddish brown, with conspicuous secondary feeding lines. Pupation outside the mine. See also Seidel (1926a) for an extensive description of the mine (Bladmineerders van Europa).

Larva: The larva is described by Seidel (1926).

Puparium: Yellow; anterior spiracle openings arranged in large arcs, not elevated on a fan-shaped structure; posterior spiracles each with the central opening larger and more raised than the lateral openings (White, 1988).

Hosts in Britain:

Hosts elsewhere:

Time of year - mines: August-October (Hering, 1957).

Time of year - adults: Unknown.

Distribution in Great Britain and Ireland: England, as far north as Yorkshire, and Wales (White, 1988); Cambridgeshire, East Norfolk, North Hampshire and South Devon (NBN Gateway, as Vidalia cornuta).

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Distribution elsewhere: Widespread in continental Europe (White, 1988) including Belgium (Leclercq and de Bruyn, 1991), Austria, Germany, Italian mainland, Poland, Russia - Central, Slovakia, Slovenia and Switzerland (Merz and Korneyev, in Fauna Europaea).

Also recorded in East Palaearctic (Merz and Korneyev, in Fauna Europaea).

NBN interactive distribution map(s) of known host species in Great Britain and Ireland and elsewhere:

Parasitoids in Britain and elsewhere: Unknown.