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Stem / Petiole borer: Primarily a borer in the stem and petiole, but the larva can make corridor-like excursions into the blade. Neither larvae nor mines can be distinguished from those of Pegomya flavifrons (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.

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).

Comments: Ackland in Chandler (1978) did not indicate whether his host records were British or Foreign and are therefore tentatively included under 'Hosts in Britain' and 'Hosts elsewhere'.

Hosts in Great Britain and Ireland:

Hosts elsewhere:

Time of year - mines: April-May and September-October (Hering, 1957).

Time of year - adults: Currently unknown.

Distribution in Great Britain and Ireland: Recorded in Britain by Ackland (1978) including Anglesey, Ayrshire, Berkshire, Breconshire, Caernarvonshire, Cambridgeshire, Cardiganshire, Carmarthenshire, Cheshire, Cumberland, Denbighshire, Derbyshire, Dorset, Durham, East Cornwall, East Gloucestershire, East Ross, East Suffolk, East Sussex, Easterness, Elgin, Fife, Flintshire, Glamorgan, Herefordshire, Huntingdonshire, Isle of Wight, Merionethshire, Monmouthshire, Montgomeryshire, North Devon, North Hampshire, North Northumberland, North Somerset, North Wiltshire, North-east Yorkshire, Nottinghamshire, Oxfordshire, Pembrokeshire, Radnorshire, Shropshire, South Aberdeenshire, South Devon, South Hampshire, South Lancashire, South-west Yorkshire, Surrey, West Cornwall, West Gloucestershire, West Suffolk, Westmorland and Worsestershire (NBN Atlas).

Also recorded in the Republic of Ireland (Michelsen in Fauna Europaea).

Distribution elsewhere: Widespread in continental Europe including The Netherlands, Belgium (Gosseries and Ackland, 1991; de Meijere, 1939), Austria, ? Bulgaria, ? Corsica, Czech Republic, Denmark, Faroe Is., Finland, French mainland, Germany, Hungary, Italian mainland, Norwegian mainland, Poland, Russia - East, North, Central and Northwest, Slovakia, Spanish mainland and Switzerland (Michelsen in Fauna Europaea).

Also recorded in East Palaearctic and Neractic Region (Michelsen in Fauna Europaea).

NBN Atlas links to known host species:

British and Irish Parasitoids in Britain and elsewhere: