Andricus seminationis (Giraud, 1859)
Quercus robur, Belgium, prov. Antwerp, Meerhout, Keyfheide, 9.v.2015 © Carina Van Steenwinkel: the axis of the inflorescence is swollen and malformed, but the galls are yet to appear
Quercus robur, Belgium, prov. Limbourg, Maasmechelen, 12.v.2018 © Carina Van Steenwinkel: young galls
Quercus robur, Belgium, prov. Antwerp, Meerhout, Keyfheide, 9..v.2015 © Carina Van Steenwinkel: older galls – unstalked, presumably parasitised
Quercus robur, Belgium, prov. Antwerp, Balen, Scheps, 7.vi.2015 © Carina Van Steenwinkel: mature galls
Quercus spec., Belgium, prov. Limbourg, Nieuwerkerken, Schelfheide, 12.x.2019 © Carina Van Steenwinkel: old (date!), parasitised gall
Quercus robur, België, prov. Namen, Étang de Virelles, 9.vi.2015 © Stéphane Claerebout
Quercus robur, Loenen (Gld), 1.vi.2017 © Arnold Grosscurt: older gall
leaf gall (from Houard, 1908a)
Catkin gall, rarely leaf gall. Generally the gall is preceded by a strong, often angular swelling of the axis of the catkin. Days later the gall itself appears. The fresh gall is green, slender fusiform, 6-8 mm long, ribbed lengthwise. The young gall has short but obvious, downwards directed hairs, that later disappear. The gall stands on a stalk of c. 5 mm (except when parasitised). Often several galls in a male catkin. As a leaf gall the gall is attached to the leaf margin. Galls in May-June; the wasps emerge in the spring of the second year.
Quercus petraea, pubescens, robur.
Only the agamous generation is known.
Béguinot (2003a), Bellmann (2012a), Buhr (1965a), Chinery (2011a), Dauphin & Aniotsbehere (1997a), Eady & Quinlan (1963a), Hellrigl (2009a), Hellrigl & Bodur (2015a), Houard (1908a), Koops (2013a), Kwast (2012a, 2014a), Lambinon, Schneider & Chevin (2003a), Meika (2006a), Melika, Csóka & Pujade-Villar (2000a), Redfern & Shirley (2011a), Roskam (2009a), Tomasi (2014a), Wiebes-Rijks (1976a), Williams (2010a).