Plant Parasites of Europe

leafminers, galls and fungi

Ocnerostoma friesei

Ocnerostoma friesei Svensson, 1966

grey pine ermine

Ocnerostoma friesei larva

Pinus sylvestris, Hilversum (winter); tip of the needle to the left

Pinus sylvestris, Posbank; tip of needle, with an egg


The mine begins at an oval egg on the flat side of the tip of a needle. Working from here the larva mines the needle for about one quarter of its length. Apart from the larval chamber, the entire mine is filled with frass. The full grown larva leaves the mine by an opening made at the end of te mine, then forms a cocoon between a few needles that have been spun together. Only the pupa enables discrimination from O. piniarella.


Pinaceae, monophagous

Pinus mugo, sylvestris.

Reported occurrences on Abies alba, and especially Juniperus need further confirmation.


Larvae in December – March and June – July (Agassiz, 1996a), adults in April – May and August (Koster, 1990a).


BE recorded (Phegea, 2010).

NE recorded (Kuchlein & de Vos, 1999a;, 2010).

LUX not recorded (Fauna Europaea, 2010).

distribution within Europe

From Fennoscandia and North Russia to Spain and the Alps, and from Ireland to the Ukraine (Fauna Europaea, 2010).




Agassiz (1996a), Baldizzone (2004a), Bengtsson & Johansson (2011a), Corley, Merckx, Cardoso, Dale,Marabuto, Maravalhas & Pires (2012a), Gómez de Aizpúrua (2003a), Huemer (2012a), Koster (1990a), Kuchlein & Donner (1993a), Kuchlein & de Vos (1999a), Patočka & Turčáni (2005a), Robbins (1991a), Svensson (1966a).


Last modified 16.ii.2018