(Coleoptera, Diptera, Hymenoptera and Lepidoptera)
by
Brian Pitkin, Willem Ellis, Colin Plant and Rob Edmunds
Ophiomyia
simplex (Loew, 1869)
[Diptera:
Agromyzidae]
Asparagus miner
Agromyza
simplex Loew. 1869a. Berl. ent. Z. 13: 46
Agromyza simplex Loew. 1869a; Hendel, 1920. Fliegen
palaearkt. Reg. 6(2): 128
Ophiomyia simplex Loew. 1869a; Spencer, 1966. Beitr.
Ent. 16: 55
Ophiomyia simplex (Loew, 1869a); Spencer, 1972b. Handbk
ident. Br. Ins. 10(5g): 10, 11, 20,
22, 125
Ophiomyia simplex (Loew, 1869a);
Spencer, 1976. Fauna ent. Scand. 5(1): 77-8, figs
103-6.
Ophiomyia simplex (Loew, 1869a); Spencer, 1990.
Host specialization in the World Agromyzidae (Diptera)
: 325, 326 (figs 1136-7), 335.
Stem-mine: Oviposition normally takes place near the base of the stem. Larva forming external stem-mine, feeding first upwards for as much as 30 cm, then turning and continuing downwards. A number of larvae may feed in a single stem and young plants may turn yellow and die. Pupation immediately beneath the epidermis (Spencer, 1976: 78).
Oviposition in the rind of the stem, just above the ground. A corridor from there runs upwards for about 30 cm, then reverts and descends to about ground level. Pupation in the mine, just below the epidermis. Usually several mines on one plant; the plant can effectively be ringed and be killed (Bladmineerders van Europa, as Hexomyza simplex)).
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 Dempewolf (2001: 79).
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).
Pale or darker brown; posterior spiracles each having about 16 bulbs (Spencer, 1976: 78).
Comments: Recently simplex has been treated as a species of Hexomyza. It is a pest of Asparagus.
Hosts in Great Britain and Ireland:
Hosts elsewhere:
Time of year - mines: June-August (Hering, 1957).
Time of year - adults: Currently unknown.
Distribution in Great Britain and Ireland: Occuring wherever the host plant is regularly cultivated. Oxfordshire (Oxford), Lancashire (Formby), Kent (Godmersham), Surrey (Wisley), Dorset (Chickerell), Hertfordshire (Harpenden), Worcestershire (Evesham) and Suffolk (Newmarket) (Spencer, 1972b: 22).
Distribution elsewhere: Europe (Spencer, 1976: 77) including Germany (Dempewolf, 2001: 79), Denmark, French mainland, Hungary, Italian mainland and Poland (Fauna Europaea).
Also recorded in the U.S.A. and eastern Canada (Spencer, 1976: 77).
NBN Atlas links to known host species:
British and Irish Parasitoids in Britain and elsewhere: