Quercus robur, Belgium, prov. Namur, Saint-Servais, Asty-Moulin, 5.vi.2009 © Jean-Yves Baugnée

Quercus robur, Mierlo, Wolfsven, 1.ix.2012: the gall has five ribs © Arnold Grosscurt

opened gall

Quercus robur, Dronten, Roggebotsebos, 28-31.viii.2019 © Arnold Grosscurt

this gall has a much longer stalk

… and contains inquilines

gall

Slender, unilocular, fusiform gall, less than a cm in size, on a stalk at least as long as the gall itself. Galls from May till October, mature in August.

hostplants

Fagaceae, monophagous

Quercus petraea, pubescens, robur.

on Quercus, sexuele generation

Quercus robur, Germany, Saarland, Bexbach © Volker Fäßler

another specimen

Quercus robur, Dronten © Arnold Groscurt

detail

Quercus robur, Ackerdijkse Plassen © Ben van As

in this case the catkins have extended normally

gall

The sexual generation forms catkin galls, c. 2 mm long, bearing white hairs that are much longer then the diameter of the gall. Often the galls are partly hidden by the bud scales; often also the catkins don’t extend to their normal length. Often high in the canopy of mature trees. Galls are mature end of May.

host plants

Fagaceae, monophagous

Quercus petraea, pubescens, robur.

synonyms

Andricus cirratus Adler, 1881; A. giraudi Wachtl, 1882.

references

Béguinot (2002g, 2006b, 2007b), Bellmann (2012a), Blanes-Dalmau, Caballero-López & Pujade-Villar (2017a), Buhr (1965a), Burton, Carbonnelle, Ellis & Schneider (2019a), Cerasa (2015a), Chinery (2011a), Eady & Quinlan (1963a), Groom (2011a), Hellrigl & Bodur (2015a), Houard (1908a), Katılmış & Kıyak (2008a), Kemal & Koçak (2010a), Koops (2013a), Kwast (2012a), Lambinon, Carbonnelle & Claerebout (2015a), Lambinon Schneider & Feitz (2012a), Marković (2014a, 2015a), Melika (2006a), Melika, Csóka & Pujade-Villar (2000a), Nieves-Aldrey (1983a, 2001a), Redfern & Shirley (2011a), Roskam (2009a), Tavares (1905a [“cirrhatus”]), Tomasi (2014a), Wiebes-Rijks (1976a), Williams (2010a).