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Agromyza nigrescens Hendel, 1920 [Diptera: Agromyzidae] Geranium leaf-miner Agromyza nigrescens Hendel, 1920. Arch. Nautrgesch. 84A(7)(1918): 117. Agromyza heringi de Meijere, 1925. Tijdschr. Ent. 68: 220. Agromyza nigrescens Hendel, 1920; Hendel, 1931. Fliegen palaearkt. Reg. 6(2): 134. Agromyza nigrescens Hendel, 1920; Spencer, 1972b. Handbk ident. Br. Ins. 10(5g): 41, 116. Agromyza nigrescens Hendel, 1920; Spencer, 1976. Fauna ent. Scand. 5(1): 127-8, figs 114, 219-221. Agromyza nigrescens Hendel, 1920; Spencer, 1990. Host specialization in the world Agromyzidae (Diptera) : 151 (figs 568-9),152, 157, 178, 398.

Leaf-mine: An initially narrow linear mine which after first moult widens into large linear or irregular blotch; frass in distinct rows in the early linear section, later more scattered (Spencer, 1976: 128-9, fig. 221). The mine is illustrated in British leafminers and Nederlandse bladmineerders. Larva: Details unknown. Puparium: Reddish-brown; posterior spiracles each with 3 bulbs (Spencer, 1976: 128). Hosts in Britain: Geraniaceae       Geranium     Mines in BMNH Geranium spp.   Spencer, 1972b: 116 Geranium robertianum Herb-Robert Robbins, 1991: 38 Hosts elsewhere: Geraniaceae       Geranium     Spencer, 1976: 128 Geranium     Spencer, 1990: 157 Geranium palustre   Nederlandse bladmineerders Geranium pratense Meadow Crane's-bill Spencer, 1990: 152 Geranium pratense Meadow Crane's-bill Nederlandse bladmineerders Geranium robertianum Herb-Robert Nederlandse bladmineerders Geranium sylvaticum Wood Crane's-bill Nederlandse bladmineerders Time of year - mines: September. Time of year - adults: Unknown. Distribution in Britain: Widespread in Britain including Middlesex (Greenford) (British leafminers), Surrey (Kew), York (Gorsdale Scar), Cardiff, Edinburgh (Spencer, 1972b: 41), Warwick (The Bogs) (Robbins, 1991: 38) and Cumbria (NBN Gateway distribution map - BRERC and DF). Distribution elsewhere: Widespread throughout Europe including Denmark, Finland, Norway, Sweden, the Mediterranean area (Spencer, 1976: 128), Germany (Spencer, 1976: 546), Canary Is., Czech Republic, Estonia, Italian mainland, Lithuania, Malta, Poland, Spanish mainland and Switzerland (Martinez in Fauna Europaea). Parasiitoids: Chrysocharis amyite (Walker, 1839) Hymenoptera: Eulophidae Miscogaster hortensis Walker Hymenoptera: Pteromalidae

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Last updated 16-Aug-2008  Brian Pitkin