Plant Parasites of Europe

leafminers, galls and fungi

Fomoria weaveri

Fomoria weaveri (Stainton, 1855)

cowberry pigmy

Fomoria weaveri mine

Vaccinium vitis-idaea, Belgium, prov. Liège, Eupen; © Jean-Yves Baugnée

Fomoria weaveri young mine

Vaccinium vitis-idaea, Belgium, prov. Liège, Lierneux, fagne de la Crépale: young mine; © Jean-Yves Baugnée


Oviposition at the underside of the leaf. The mine begins as a long corridor, with the frass in a thick central line. This gallery abruptly widens into a large full depth blotch, with a central concentration of frass. The full-grown larva makes an exit slit in the lower epidermis, then spins within the mine an orange-yellow cocoon, that is connected with the exit by a silken tunnel. The cocoon causes the leaf to pucker blister-like (Johansson ao, 1990a).

host plants

Ericaceae, narrowly monophagous

Vaccinium vitis-idaea.


Larvae from autumn till May of the following year (Emmet, 1983a).


BE recorded (Phegea, 2009).

NE recorded (Kuchlein & de Vos, 1999a;, 2009).

LUX not recorded (Fauna Europaea, 2009).

distribution within Europe

From Fennoscandia and northern Russia to the Pyrenees and Italy, and from Britain to central Russia.


Pale amber, head light brown.


Nepticula, Stigmella, Ectoedemia, weaveri.


De mines can be mistaken for the youth mine of Coleophora glitzella. That one quickly widens, ending upon a large excision. The narrow gallery of weaveri ends in a small ± triangular slit.


Anisimovas, Diškus & Stonis (2006a), Bengtsson (2008a), Borkowski (1969a), Buhr (1964a), J Černý (2001a), Diškus & Stonis (2012a), Emmet (1983a), Gielis, Huisman, Kuchlein ao (1985a), Gustafsson (1985a), Gustafsson & van Nieukerken (1990a), Haase (1942a), Hartig (1939a), Hering (1921b, 1957a), Huemer (2012a), Huisman, Koster, van Nieukerken & Ellis (2007a), Johansson ao (1990a), Klimesch (1989a), Kozlov & Kullberg (2010a), Kuchlein & Donner (1993a), Kuchlein & de Vos (1999a), Kurz (2016a), Laštuvka & Laštuvka (1997a), van Nieukerken (1986a, 2021a), van Nieukerken, A & Z Laštuvka (2006a), van Nieukerken, Zolotuhin & Mistchenko (2004a), Nowakowski (1954a), De Prins & Steeman (2011a), Robbins (1991a), Schmid (2019a), Skala (1939a), Skala & Zavřel (1945a), Sønderup (1949a), Szőcs (1977a), Zaberga, Legzdina, Otfinowski & Obelevičius (2014a).

Last modified 13.ii.2021