Leaf-mine: A narrow upper surface linear branching mine without apparent feeding lines. Frass in isolated grains and pearl chains. At least in Erigeron older mines turn reddish-brown. Pupation external (Spencer, 1976: 413; Bladmineerders van Europa).

Larva: The larva is described by de Meijere (1928, as erigerophila, 1937 as asteribia) and Griffiths (1976c); posterior spiracles each with 8-11 bulbs (Bladmineerders van Europa).

Puparium: Black; posterior spiracles on short conical projections, each with an ellipse of about 13 bulbs (Spencer, 1976: 413).

Comments: Erigeron acer is treated as Erigeron acris (Blue Fleabane) by Stace (2010).

Hosts in Britain:

Hosts elsewhere:

Time of year - mines: June-July and September (Hering, 1957).

Time of year - adults: Unknown.

Distribution in Great Britain and Ireland: Occurence in Britain first recorded by Robbins (1989) and confirmed by Deeming (1995). Warwickshire (Hartshill and Ladywalk) (Robbins, 1991); Glamorgan (NBN Gateway - N.B. includes Watsonian Vice Counties having publicly available records that fall within or overlap the vice county border at 10km resolution or better i.e. a record for a vice county may relate to an adjacent vice county - for included datasets see NBN Grid map below).

NBN Grid map: Note that not all datasets on the NBN Gateway may be available on the map below. If you are an NBN Gateway registered user you can request access for missing datasets via the link 'Open interactive map in new window' below.

Distribution elsewhere: Widespread in continental Europe, including Denmark, Finland, France, Norway (Spencer, 1976: 413), The Netherlands (Bladmineerders van Europa), Germany (Spencer, 1976: 570), Bulgaria, Corsica, Czech Republic, Lithuania and Poland (Martinez 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.