Plant Parasites of Europe

leafminers, galls and fungi

Agromyza nigrescens

Agromyza nigrescens Hendel, 1920

Agromyza nigrescens on Geranium columbinum

Geranium columbinum, Belgium, prov. Namur, Dourbes, Montagne aux Buis, 17.v.2023 © Stéphane Claerebout

Agromyza nigrescens: mine on Geranium pusillum

Geranium pusillum, Amstelveen, Schinkelbos

Agromyza nigrescens: mine

larva and frass

Agromyza nigrescens: mine on Geranium rotundifolium

young mine

Agromyza nigrescens: mine on Geranium robertianum

Geranium robertianum, Blitterswijck; © Wouter Bosgra

Agromyza nigrescens: mine on Geranium rotundifolium

Geranium rotundifolium, Spain, Pyrenees, Esterri d’Anneu; © Paul van Wielink

Agromyza nigrescens: mine


Agromyza nigrescens mine

strongly different mine on Geranium columbinum, Belgium, prov. Namur, Sosoye; © Jean-Yves Baugnée


The mine is described by Hering (1957a) as follows: “Upper-surface mine. The start is corridor-like and generally follows the leaf margin. Further on the mine widens considerably, forms a secondary blotch and gets irregular sides that are deeply eaten out. Primary and secondary feeding lines clearly visible. Frass mostly in large clumps. Pupation outside the mine. The mine only rarely occurs inGeranium robertianum; the frass then is fine-grained and the mines are smaller.”

The Dutch material differs considerably from both of these types, in particular because much of the frass is in long threads. Hering didn’t think it impossible the the miners of Geranium robertianum and the other Geranium species might be different species; in this line the Dutch material might form a third species. But it also is possible to suppose an unusually strong effect of the host plant species upon the mine and the frass pattern.

host plants

Geraniaceae, oligophagous

Erodium moschatum; Geranium columbinum, dissectum, molle, nodosum, palustre, phaeum, pratense, purpureum, pusillum, robertianum, rotundifolium, sanguineum, sylvaticum.


Larvae in summer (Robbins, 1991a). The larvae of the Dutch material were collected in the first half of September.


BE recorded (prov. Namur, Jean-Yves Baugnée).

NE recorded (Ellis, 2007: Amstelveen).

LUX not recorded (Fauna Europaea (2007).

distribution within Europe

Europe west of the line Finland – Poland – Serbia, but not (yet?) known from Ireland (Fauna Europaea (2007).




Agromyza microchaeta Hendel, 1920, A. heringi de Meijere, 1925, A. oycoviensis Beiger, 1960.


While Hering (1957a( writes that the species is rare on G. robertianum, Robbins (1991a) states that in the UK robertianum is the only hostplant. This matches with Hering’s hunch that nigrescens may be a mix of two species.


Beiger (1960a, 1970a, 1972e), Buhr (1930a, 1932a, 1941a,b, 1964a), Černý (2004a, 2011A), Černý & Merz (2006a, 2007a), Černý & Vála (1999a), Chałańska, Łabanowski & Soika (2006a), Ci̇velek, Çikman & Dursun (2008a), Gil Ortiz (2009a), Hartig (1939a), Hering (1927a, 1932e, 1955b, 1957a, 1967a), Huber (1969a), Maček (1999a), Masetti, Lanzoni, Burgio & Süss (2004a), de Meijere (1925a), Michalska (1970a), Ostrauskas, Pakalniškis & Taluntytė (2003a), Pakalniškis (1993a), Papp & Černý (2015a), Robbins (1991a), Rydén (1956a), Skala (1951a), Skala & Zavřel (1945a), Sønderup (1949a), Spencer (1953a, 1957f, 1972a,b, 1973c, 1976a), Starý (1930a), Surányi (1942a), von Tschirnhaus (1999a), Withers (2007a), Zlobin (1986b).

Last modified 23.v.2023