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Leaf-miner: 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 larvae of flies are leg-less maggots without a head capsule (see examples). They never have thoracic or abdominal legs. They do not have chewing mouthparts, although they do have a characteristic cephalo-pharyngeal skeleton (see examples), usually visible internally through the body wall.

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: The puparia of flies are formed within the hardened last larval skin or puparium and as a result sheaths enclosing head appendages, wings and legs are not visible externally (see examples).

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 Great Britain and Ireland:

Asteraceae
Erigeron	acer	Blue Fleabane		Robbins, 1991: 112-3
Erigeron	canadensis	Canadian Fleabane		Robbins, 1991: 112-3

Hosts elsewhere:

Asteraceae
Aster				Spencer, 1990: 274
Aster	amellus	European Michaelmas-daisy		Bladmineerders van Europa
Aster	novi-belgii	Confused Michaelmas-daisy		Bladmineerders van Europa
Conyza	canadensis	Canadian Fleabane		Bladmineerders van Europa
Erigeron				Spencer, 1990: 274
Erigeron				Spencer, 1976: 413
Erigeron	acer	Blue Fleabane		Bladmineerders van Europa, as Erigeron acris
Erigeron	annuus	Tall Fleabane		Bladmineerders van Europa
Hieracium				Bladmineerders van Europa

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

Time of year - adults: Currently 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 Atlas).

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 (Fauna Europaea).

NBN Atlas links to known host species:

British and Irish Parasitoids in Britain and elsewhere: Currently unknown.