Plant Parasites of Europe

leafminers, galls and fungi

Trachys problematicus

Trachys problematicus Oberberger, 1918

Trachys problematicus: occupied mine

occupied mine (from Kwast)


Full depth, transparant blotch. Oviposition site covered by a shining black drop of hardened secretion. Frass in granules or thread fragments. Pupation in the mine, pupa not in a cocoon.

host plants

Lamiaceae, monophagous

Stachys annua, germanica, recta.

S. recta seems the most important host plant). Bilý (2002a) also mentions Mentha, but this may be due to confusion with T. scrobiculatus.


Larvae in June-July (Hering, 1957a).


BE not recorded (Fauna Europaea, 2007).

NE recorded (Fauna Europaea, 2007), but there are no Dutch records to support this.

LUX not recorded (Fauna Europaea, 2007).

distribution within Europe

From Germany to Russia and Bulgaria (Fauna Europaea, 2007).


Described by von Frauenfeld (1864a, as T. pumila).


von Frauenfeld (1864a).


Trachys problematica.


Also on Stachys mines Trachys quercicola, and Hering (1957a) suggests that the two might have a subspecific relationship. The distribution patterns certainly supports Hering’s idea, but the Fauna Europaea (2007) treats them as two independent species.


Beiger (1960a, 1979a), Bilý (2002a), Brechtel & Kostenbader (2002a), von Frauenfeld (1864a), Gottwald & Hornburg (2004a), Hering (1930a,b, 1957a), Kwast (2013a), Panin, Săvulecu & Ruicănescu (2015a), Sakalian (2003a), Škorpík, Křivan & Kraus (2011a).

Last modified 18.iii.2021