Like related species, the larva mines blades of grass, in this case
usually Cock's-foot, forming a thin whitish mine (UKMoths).
larva begins in autumn the making of a long, narrow, corridor with
a fine central line of grey frass. The corridor is straight or lightly
wavy, and descends into the leaf sheath, or even into the stem or
rootstock. The larva regularly leaves the mine to begin making a
new one. Pupation external (Bladmineerders van Europa).
Larva: The larvae of moths have a head capsule and chewing mouthparts with opposable mandibles (see video of a gracillarid larva feeding), six thoracic legs and abdominal legs (see examples).
Pale greenish yellow; head and prothoracic plate light brown; prothoracic
plate made up of two narrow elongate sclerites (Bladmineerders van Europa).
Pupa: The pupae of moths have visible head appendages, wings and legs which lie in sheaths (see examples).
The adult is illustrated in UKMoths.
and female genitalia are illustrated by the Lepidoptera Dissection Group.
Hosts in Great Britain & Ireland:
of year - larvae:
May (Bladmineerders van Europa)
of year - adults: The moths can be found on the wing any time
between May and September, and are attracted to light (UKMoths).
in Great Britain & Ireland: A fairly common and well distributed
grassland species over most of the British Isles (UKMoths)
including Anglesey (VC52), Banffshire (VC94), Bedfordshire (VC30), Caernarvonshire (VC49), Cambridgeshire (VC29),
Cheshire (VC58), Cheviotland, Cumberland (VC70), Derbyshire (VC57), East Cornwall (VC2), East Norfolk (VC27), East Suffolk (VC25), Easterness (VC96), Flintshire (VC51), Glamorganshire (VC41), Kincardineshire (VC91),
Merionethshire (VC48), North Aberdeenshire (VC93), North Devon (VC4), North Ebudes (VC104), North Essex (VC19), North Hampshire (VC12), North Somerset (VC6), North Wiltshire (VC7), South Northumberland (VC67), Pembrokeshire (VC45), Shropshire (VC40), South Aberdeenshire (VC92), South Lancashire (VC59),
South Wiltshire (VC8), Staffordshire (VC39), Warwickshire (VC38), West Cornwall (VC1), West Gloucestershire (VC34),
West Kent (VC16), West Norfolk (VC28), West Suffolk (VC26), Westmorland (VC69) and Worcestershire (VC37) (NBN
Gateway), the Channel Is. and Ireland (Karsholt and van Nieukerken
in Fauna Europaea).
Also recorded in the Republic of Ireland (Ireland's NBDC interactive map).
NBN Grid Map:
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elsewhere: Widespread in continental Europe including Austria,
Belgium, Bulgaria, Czech Republic, Danish mainland, Estonia, French
mainland, Germany, Hungary, Latvia, Luxembourg, Norwegian mainland,
Poland, Romania, Russia - Central, Slovakia, Sweden, Switzerland,
The Netherlands and Ukraine (Karsholt and van Nieukerken in Fauna Europaea).
NBN Interactive Grid Maps of known host species:
British and Irish Parasitoids in Britain and elsewhere: