Quercus robur, Belgium, East Flanders, Balegem, Oosterzele @ Bart Uitterhaegen: the galls mainly occur in callus tissue

detail: fresh and vacated, weathered, galls

Quercus robur, Belgium, East Flanders, Geraardsbergen, Dendervallei Onkerzele @ Bart Uitterhaegen: these fresh galls are intensely visited by ants

Quercus robur, Belgium, prov Liège, Mortroux: vacated, but not yet weathered galls © Jean-Yves Baugnée

parasite

Groups of ± 6 mm large, more or less conical, green to brown galls, embedded in the bark of mature trees. Galls are mature in May; they lack the radiating striation that occurs in A. rhyzomae and sieboldi (Melika 206a:464).

host plants

Fagaceae, monophagous

Quercus lusitanica, petraea, pubescens, pyrenaica, robur.

on Quercus, sexual generation

Quercus robur, Dronten, Roggebotsebos, 28.iv.2022 © Arnold Grosscurt (a few bud scales removed)

a single gall, opened after removal of almost all bud scales

several galls

the original drawing of the synonymous Andricus gemmatus (from Adler, 1881a).

Quercus robur, Germany, Saarland, Bexbach © Volker Fäßler

gall

Bud gall. Egg-shaped, thin-walled, smooth, gall in a leaf axil, with a narrowed base attached to the scars of fallen bud scales, up to 2.5 mm large, (almost) completely hidden by the remaining bud scales. Galls in May-June, green at first, later brown.

host plants

Fagaceae, monophagous

Quercus lusitanica, petraea, pubescens, pyrenaica, robur.

synonyms

Andricus corticis Hartig, 1840; A. gemmatus Adler, 1881; A. krajnovici Tavares, 1901.

inquilines

Synergus incrassatus.

references

Bellmann (2012a), Blanes-Dalmau, Caballero-López & Pujade-Villar (2017a), Buhr (1965a), Burton, Carbonnelle, Ellis & Schneider (2019a)m √, Cerasa (2015a), Cogolludo (1921a), Dauphin & Aniotsbehere (1997a), Eady & Quinlan (1963a), Hellrigl (2009a), Hellrigl & Bodur (2015a), Houard (1908a), Katılmış & Kıyak (2008a), Kemal & Koçak (2010a), Koops (2013a), Kwast (2012a, 2014a), Meika (2006a), Melika, Csóka & Pujade-Villar (2000a), Nieves-Adrey (1983a, 2001a), Nieves-Aldrey, Gómez, Hernández Nieves & Lobo (2006a), Redfern & Shirley (2011a), Roskam (2009a), Tavares (1905a), Tomasi (2014a), Williams (2010a).