/ 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).
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 & Ireland:
of year - mines:
April-May and September-October (Hering,
of year - adults: Currently unknown.
in Great Britain & Ireland: Recorded in Britain by Ackland
(1978) including Anglesey (VC52),
Berkshire (VC22), Breconshire (VC42), Buckinghamshire (VC24), Caernarvonshire (VC49), Cambridgeshire (VC29),
Cardiganshire (VC46), Carmarthenshire (VC44), Cumberland (VC70), Denbighshire (VC50), Dorset (VC9),
County Durham (VC66), East Cornwall (VC2), East Gloucestershire (VC33), East Kent (VC15), East Norfolk (VC27),
East Ross (VC106), East Suffolk (VC25), East Sussex (VC14), Easterness (VC96), Elgin, Glamorganshire (VC41),
Herefordshire (VC36), Huntingdonshire (VC31), Isle of Wight (VC10), Merionethshire (VC48), Monmouthshire (VC35),
Montgomeryshire (VC47), North Essex (VC19), North Hampshire (VC12), North Lincolnshire (VC54),
North Somerset (VC6), North Wiltshire (VC7), North-east Yorkshire (VC62), Nottinghamshire (VC56),
Oxfordshire (VC23), Pembrokeshire (VC45), Radnorshire (VC43), Shropshire (VC40), South Aberdeenshire (VC92),
South Devon (VC3), South Essex (VC18), South Hampshire (VC11), South Wiltshire (VC8), Staffordshire (VC39),
Surrey (VC17), Warwickshire (VC38), West Cornwall (VC1), West Gloucestershire (VC34) and West
recorded in the Republic of Ireland (Michelsen in Fauna Europaea).
NBN Grid Map:
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).
recorded in East Palaearctic and Neractic Region (Michelsen in Fauna Europaea).
NBN Interactive Grid Maps of known host species:
British and Irish Parasitoids in Britain and elsewhere: