Leaf-
and stem-mine:
Oviposition can take place in the leaf, where a short mine is formed.
The young larva feeds towards the mid-rib and down into the stem.
Alternatively a true mine can be formed in the stem before the larva
burrows deeper into the pith. Pupation external (Spencer,
1976: 160).
The
larva bores in the pith of the stem, and eats this out while descending
as low as the root collar. But before that it makes a linear mine
in the green rind of the stem. Occasionally oviposition takes place
on a leaf, leading to a fine corridor (without frass) running towards
the midrib, and from there to the stem. The place where the larva
finally exits the stem for pupation is indicated by a red-ringed
hole (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).
Yellowish. Posterior spiracles each with 3 elongate bulbs (Spencer,
1976: 160).
Hosts in Great Britain and Ireland:
Hosts
elsewhere:
Time
of year - mines: September.
Time
of year - adults: June.
Distribution
in Great Britain and Ireland: Recorded in Cambridgeshire (Cambridge)
and Derbyshire (Worthington) (Spencer, 1972b: 45). Distribution
elsewhere: Widespread in continental Europe including Denmark,
Finland, Sweden (Spencer, 1976:
160), The Netherlands (Bladmineerders van Europa), Germany (Spencer,
1976: 550), Belgium, Czech Republic, Lithuania, Poland, Slovakia
and Sweden (Fauna Europaea).
NBN Atlas links to known host species:
British and Irish Parasitoids in Britain and elsewhere: Currently unknown.
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