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Agromyza geniculata Fallén, 1823a. Agromyzides Sveciae : 6
Cerodontha (Icteromyza) geniculata (Fallén, 1823a); Spencer, 1972b. Handbk ident. Br. Ins. 10(5g): 106
Cerodontha (Icteromyza) geniculata (Fallén, 1823a); Spencer, 1976. Fauna ent. Scand. 5(1): 173-4, fig. 312.
Cerodontha (Icteromyza) geniculata (Fallén, 1823a); Spencer, 1990. Host specialization in the world Agromyzidae (Diptera) : 345, 347, 348 (fig. 1313), 351.

Leaf-miner: A linear mine, frequently several larvae feeding together. Pupation at base of leaf with anterior spiracles projecting through the epidermis (Spencer, 1976: 174).

Upper-surface (rarely partly lower-surface) corridor, in about the centre of the blade. The larva changes direction at least twice (up-down-up). Normally the mine doesn't reach the leaf sheath. Larva solitary, several mines on a leaf fuse. Frass in scattered grains, strings or pearl chains. Pupation in the mine; puparium mostly upper-surface (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.

The larva is described by Nowakowski (1973).

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).

Hosts in Great Britain and Ireland:

Hosts elsewhere:

Time of year - mines: June-September (Bladmineerders van Europa).

Time of year - adults: August.

Distribution in Great Britain and Ireland: Uncommon. Buckinghamshire (Burnham Beeches), Herefordshire (Moccas Pool) (Spencer, 1972b: 106), Warwickshire (Stoneleigh) (Robbins, 1991: 132); Buckinghamshire, Cambridgeshire, Flintshire, Huntingdonshire, South Devon and South-west Yorkshire (NBN Atlas).

Distribution elsewhere: Widespread in continental Europe including Finland, Sweden, Poland and the [former] U.S.S.R. (Spencer, 1976: 174), The Netherlands (Bladmineerders van Europa), Austria, Bulgaria, Czech Republic, Denmark, Estonia, French mainland, Germany, Hungary, Italian mainland, Lithuania, Romania, Slovakia, Spanish mainland, Switzerland, Ukraine and Yugoslavia (Fauna Europaea).

Also recorded in Afghanistan (Spencer, 1976: 174).

NBN Atlas links to known host species:

British and Irish Parasitoids in Britain and elsewhere: