Leaf-mine: Mine a descending and widening corridor, in the end an elongate blotch that may occupy the entire width of the leaf. The mine contracts somewhat, narrowing the leaf. Frass in some elongate lumps in the centre of the mine (Bladmineerders van Europa).

Larva: Body dull grey green with a narrow dorsal line; head pale brown with darker marking; prothoracic plate dark brown, irregularly divided (Bladmineerders van Europa).

Pupa: Details unknown.

Adult: The adult is illustrated in UKMoths by Mark Cubitt. 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: Autumn till June; larvae hibernate in the mine (Bladmineerders van Europa).

Time of year - adults: Unknown.

Distribution in Great Britain and Ireland: Britain including Bedfordshire, Cambridgeshire, Cardiganshire, Derbyshire, Glamorgan, Herefordshire, Huntingdonshire, Kincardine, North Aberdeen, North Hampshire, North Somerset, North Wiltshire, Northamptonshire, Pembrokeshire, Shropshire, South Aberdeen, South Wiltshire, Stafford, Warwickshire, West Gloucestershire and Worcestershire (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).

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, Belgium, Corsica, Czech Republic, Danish mainland, Estonia, Finland, French mainland, Germany, Hungary, Italian mainland, Latvia, Lithuania, Norwegian mainland, Poland, Romania, Russia - Northwest, Slovakia, Sweden, Switzerland and The Netherlands (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.