Plant Parasites of Europe

leafminers, galls and fungi

Andricus paradoxus

Andricus paradoxus (Radoszkowski, 1866)

on Quercus, agamous generation

Andricus paradoxus FF: gall on Quercus robur

Quercus robur, Biddinghuizen, Spijk- en Bremerbergbos © Hans Jonkman

Andricus paradoxus FF: gall on Quercus robur

closer look

Andricus paradoxus FF on Quercus robur

Quercus robur, Belgium, prov. Namur, Feschaux, RN Rend Peine © Stéphane Claerebout

Andricus paradoxus gall

Quercus robur, Enter © Arnold Groscurt

Andricus paradoxus gall

cut lengthwise

same species, but only one larva chamber

Andricus paradoxus FF gall on Quercus robur

Quercus robur, Germany, Saarland, Bexbach © Volker Fäßler; probably this is a very young gall, of which Buhr (1964b) writes it has a “somewhat fleshy, soon withering, outer layer”.


Up to 8 mm long smooth, thin-walled, unilocular bud gal on a two years old shoot, acorn- or cone-shaped, with an apiculus on the top. The ripe gall is generally brownish violet with short whitish length streaks. When the fleshy wall dries out the gall turns brown and get length grooves. Galls from May-June; mature galls drop to the ground.

host plants

Fagaceae, monophagous

Quercus robur.

on Quercus, sexual generation


Catkin galls, less then 2 mm in size, globular, verrucose, covered by hairs of various length.

host plants

Fagaceae, monophagous

Quercus petraea, pubescens, robur.


Andricus albopunctatus von Schlechtendal, 1870; A. lambertoni Kieffer, 1897.

parasitoids, predators

Caenacis lauta; Eupelmus urozonus; Eurytoma brunniventris; Mesopolobus tibialis.


Askew (161b) Bellmann (2012a), Blanes-Dalmau, Caballero-López & Pujade-Villar (2017a), Buhr (1965a), Burton, Ellis & Schneider (2022a), Cerasa (2015a), Dauphin & Aniotsbehere (1997a), Eady & Quinlan (1963a), Hellrigl (2009a), Hellrigl & Bodur (2015a), Houard (1908a), Kwast (2012a, 2014a), Meika (2006a), Melika, Csóka & Pujade-Villar (2000a), Mutun & Dinç (2014a), Nieves-Aldrey (1983a, 2001a), Nieves-Aldrey, Gómez, Hernández Nieves & Lobo (2006a), Redfern & Shirley (2011a), Roskam (2009a), Tomasi (2014a), Wiebes-Rijks (1976a), Williams (2010a).

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