Leaf-mine: A short linear mine in first instar, later producing a circular or oval blotch. Frass is excreted in a black mass prior to pupation; puparium firmly glued with frass within the mine (Spencer, 1976: 306).

Large, whitish, upper-surface blotch, preceded by a short corridor that often is overrun later by the developing blotch. The larva hardly produces any frass; the few grains that are present are black and rather coarse. But when the larva is about to pupate, it empties its intestine, which has the effect that the puparium is anchored in the mine by dried frass (Bladmineerders van Europa).

The initial gallery by the first instar larva then leads to a whitish blotch. The pupa is fixed to the inside of the mine by an accumulation of frass (British leafminers).

Larva: The larvae was described by de Meijere (1925) and Sasakawa (1961).

Puparium: Reddish-brown to black; posterior spiracles each with 9 minute elongate bulbs (Spencer, 1976: 306).

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

Hosts in Britain:

Hosts elsewhere:

Time of year - mines: June-July.

Time of year - adults: Unknown.

Distribution in Great Britain and Ireland: Widespread in southern England including Kent (Faversham), Oxford (Oxford, Parks), Dunbarton (Bonhill), Suffolk (Flatford), Essex (Walton-on-the-Naze) (Spencer, 1972: 46) and Warwickshire (Hartshill) (Robbins, 1991: 113); East Sussex (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, Norway, Sweden (Spencer, 1976: 302), The Netherlands (Bladmineerders van Europa), Belgium (de Bruyn and von Tschirnhaus, 1991), Germany (Spencer, 1976: 562), Albania, Corsica, Czech Republic, European Turkey, French mainland, Hungary, Italian mainland, Romania, Slovakia, Spanish mainland, Switzerland and Yugoslavia (Martinez in Fauna Europaea).

Also recorded in Canada (Spencer, 1969a: 149), Argentina, South Africa, India, Australia (Spencer, 1976: 306) and Papua New Guinea (Spencer, 1990).

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

Parasitoids in Britain and elsewhere:

Biodiversity Heritage Library
Bladmineerders van Europa
British leafminers
Encyclopedia of Life
Fauna Europaea [128557]
NBN Gateway