Cynips quercusfolii Linnaeus, 1758

Quercus, agamous generation

Cynips quercusfolii: gall on Quercus robur

Quercus robur, Bergen aan Zee

Cynips quercusfolii: ripe galls drop to the ground

Generally the galls remain attached to the leaf until autumn, then drop with the leaf to the ground, but sometimes the galls drop spontaneously (?) already in late summer.

Cynips quercusfolii gall

Hollandsche Rading: opened gall; the gall is soft and juicy

Cynips quercusfolii gall

the small larval chamber

Cynips quercusfolii gall

Wolfheze: hibernation as imago in a gall that has fallen to the ground (image October 7th)

Cynips quercusfolii on Quercus robur: extremely heavy infestation

Nieuwendam: extremely heavy infestation of a small tree in the bank of a main highway

Cynips quercusfolii: cluster of galls

Quercus robur, Biddinghuizen, Spijk- en Bremerbergbos © Hans Jonkman: cluster of galls

Cynips quercusfolii: gall on a leaf remnant

the leaf around the gall has been completely eaten away. This demonstrates that the gall for its development attract nutritients not so much from the leaf as from the plant as a whole, through the leaf venation/


Galls from July till October, mature in August.

host plants

Fagaceae, monophagous

Quercus frainetto, macranthera, petraea, pubescens, pyrenaica, robur.

Rarely also Q. cerris.


Archarius pyrrhoceras.

Quercus, sexual generation

Cynips quercusfolii: sexual gall on Quercus petraea

Quercus petraea, Belgium, prov. Namur, Couvin, Frasnes © Stéphane Claerebout: group of dormant buds with two young galls

Cynips quercusfolii: sexual generation gall on Quercus robur

Quercus petraea, Belgium, East Flanders, Geraardsbergen, Overboelare-Planken @ Bart Uitterhaegen: as the galls grow older, the colour changes from reddish to dark purple


The sexual generation makes egg-shaped, velvety galls of about 2 mm on resting buds; initially they are red. Contrary to Cynips longiventris, at the base of the gall remnants of bud scales are visible.

host plants

Fagaceae, monophagous

Quercus frainetto, x hispanica, infectoria, petraea, pubescens, pyrenaica, robur.

Rarely also Q. cerris.


Dryophanta folii Hartig, 1840; D. scutellaris Olivier, 1781; D. flosculi (Giraud, 1868); D. taschenbergi (von Schlechtendal, 1870).


In the agamous generation there is a significant preference for the larger leaves (Giertych ao, 2013a).


Abras, Fassotte, Chandelier & Cavelier (2008a), Béguinot (2002a,e,f,g,h, 2003a, 2006a,c, 2007b, 2012a), Bellmann (2012a), Blanes-Dalmau, Caballero-López & Pujade-Villar (2017a), Cerasa (2015a), Chinery (2011a), Cogolludo (1921a), Coulianos & Holmåsen (1991a), Dauphin & Aniotsbehere (1997a), Dietrich (2016a), Eady & Quinlan (1963a), Ecott (2012a), Giertych, Jagodziński & Karolewski (2013a), Groom (2011a), Guzicka, Karolewski & Giertych (2017a), Hellrigl (2009a, 2010a, 2012a), Hellrigl & Bodur (2015a), Houard (1908a), Ilie & Marinescu (2011a), Katılmış & Kıyak (2008a), Kemal & Koçak (2010a), Kollár (2007a, 2011a), Koops (2013a), Kwast (2012a, 2014a), Lambinon, Carbonnelle & Claerebout (2015a), Lambinon, Schneider & Chevin (2003a), Lehmann & Hannover (2016a), Marković (2014a, 2015a), Melika (2006a), Melika, Csóka & Pujade-Villar (2000a), Mete & Demirsoy (2012a), Nieves-Aldrey (2001a), Pellizzari (2010a), Redfern & Shirley (2011a), Roques, Cleary, Matsiakh & Eschem (2017a), Roskam (2009a), Tomasi (2003a, 2012a, 2014a), Williams (2010a).

mod 4.iv.2019