Leaf-mine: Makes long narrow galleries. The frass is distributed through the mine and also some is ejected. The larvae may mine more than one leaf (British leafminers).

Elongate, rather irregular blotch. Most frass is ejected, what remains is concentrated in a few heaps. The larva makes several mines. Pupaton outside the mine (Bladmineerders van Europa).

Larva: Head flattened, blackish brown with U-shaped marking. Body yellow, ventrally a light brown, more or less oblong, spot on each segment; prothoracic plate dark brown and divided into two irregular parts; anal plate almost colourless; thoracic legs very light brown (Koster, 2002c) (Bladmineerders van Europa).

Pupa: Details unknown.

Adult: The adult is illustrated in UKMoths. The genitalia are not illustrated by the Lepidoptera Dissection Group (check for update).

Comments: Festuca arundinacea is treated as Schedonorus arundinacea (Tall Fescue) by Stace (2010).

Hosts in Britain:

Hosts elsewhere:

Time of year - larvae: August-May (British leafminers).

Time of year - adults: Unknown.

Distribution in Great Britain and Ireland: Britain including Cambridgeshire, East Suffolk, Herefordshire, North Hampshire, Pembrokeshire and South Wiltshire (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). Prefers damp humid habitats eg woodland, fens etc (British leafminers).

Also recorded in the Republic of Ireland (Karsholt and van Nieukerken in Fauna Europaea).

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 Austria, Belarus, Bulgaria, Croatia, Czech Republic, Danish mainland, Estonia, Finland, French mainland, Hungary, Italian mainland, Latvia, Lithuania, Poland, Romania, Russia - East, Northwest and South, Slovakia, Spanish mainland, Sweden, Switzerland, Ukraine and ? Yugoslavia (Karsholt and van Nieukerken 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.