/ stem-borer: Very variable mine - corridor or blotch, with
or without frass (Bladmineerders van Europa).
larvae mine the leaves at first. In leeks it then bores through
them and later enters the middle to feed on the inner leaves. In
onion it feeds inside the leaves and can enter the bulb to feed
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).
The larva is described by Heppner (1987)
and illustrated in British
Pupa: The pupae of moths have visible head appendages, wings and legs which lie in sheaths (see examples).
The larva pupates in an open network cocoon, either on the foodplant
or close by (UKMoths
The adult is illustrated in UKMoths and the Encyclopedia
of Life. The male
genitalia are illustrated by the Lepidoptera Dissection Group.
Hosts in Great Britain & Ireland:
of year - larvae: May - June; August - October (British
of year - adults: Two generations - June and July, and from
October through the winter to early spring (UKMoths).
in Great Britain & Ireland: Although it has the potential
to be a pest, it is rather scarce and local. It is distributed mainly
in the south-east of England, especially around the coast (UKMoths)
including Bedfordshire (VC30), East Cornwall (VC2), East Gloucestershire (VC33), East Norfolk (VC27), East Suffolk (VC25), East Sussex (VC14), Glamorganshire (VC41), North Essex (VC19), North Somerset (VC6), North Wiltshire (VC7), South Devon (VC3), South Wiltshire (VC8), Surrey (VC17),
West Gloucestershire (VC34), West Norfolk (VC28), West Suffolk (VC26) and Worcestershire (VC37) (NBN
Gateway). Also Cheltenham, East Gloucestershire (British
NBN Grid Map:
NBN Grid Map : NBN Terms and Conditions
Maps are only displayed if the NBN server is active. N.B. Only publicly available records, if any, are shown by default
elsewhere: Widespread in continental Europe including Austria,
Balearic Is., Belarus, Belgium, Corsica, Czech Republic, Danish
mainland, Estonia, Finland, French mainland, Germany, Hungary, Italian
mainland, Kaliningrad Region, Latvia, Liechtenstein, Lithuania,
Luxembourg, Norwegian mainland, Portuguese mainland, Romania, Russia
- Central, North and Northwest, Slovakia, Slovenia, Sweden, Switzerland,
The Netherlands, Ukraine and Yugoslavia (Karsholt and van Nieukerken
in Fauna Europaea).
NBN Interactive Grid Maps of known host species:
British and Irish Parasitoids in Britain and elsewhere: