Andricus quercusramuli (Linnaeus, 1761)
cottonwool gall wasp
on Quercus, agamous generation
Quercus robur, UK, Suffolk, Kelsale, 8.xi.2018 © Jeremy Bowdrey
Quercus robur, Dronten, Binnenbos, 4.v.2020 © Arnold Grosscurt: old, worn gall
Quercus robur (from Houard, 1908a)
gall
Egg-shaped, thin-walled bud gall with a distinct acute tip, 3-5 mm long, for c. 2/3 hidden by the bud scales. The smooth outer wall is succulent; when the gall matures the wall dries, becomes whitish and acquires length grooves. Galls in September-October; mature galls drop to the ground.
host plants
Fagaceae, monophagous
Quercus petraea, pubescens, robur.
on Quercus, sexual generation
Quercus petraea, Hungary, Kimle, 24.v.2018 © László Érsek
fresh galls
other side
individual gall chambers
a single gall chamber, with larva
detail
larve
older galls (same tree, 24.v.2018)
detail
Quercus pubescens, Spain, Catalunya, prov. Barcelona, Palau Solià i Plegamans © Jordi Montobbio
Quercus pubescens, Spain, Catalunya, prov. Barcelona, Cerdanyola: split gall © Jordi Montobbio
Quercus robur, Wijk aan Zee, 30.v.2019 © Cor Zonneveld
detail
parasite
Galling of a male catkin. Attached to the petiole of a catkin is a group of 1-20 cells, each 1-2 mm in diameter, each with a mass of white hairs, altogether creating an almost walnut sized white globe. The galls are mature in June, but galled catkins remain on the tree until as late as August.
host plants
Fagaceae, monophagous
Quercus faginea, frainetto, lusitanica, petraea, pubescens, pyrenaica, robur.
synonyms
Andricus ramuli Schenck, 1863; A. autumnalis Hartig, 1840; A. trifasciata Kieffer, 1901.
references
Andersen & Fjellberg (1977a), Béguinot (2000b), Bellido, Ros-Farré & Pujade-Villar (2003a), Bellmann (212a), Blanes-Dalmau, Caballero-López & Pujade-Villar (2017a), Buhr (1965a), Cerasa (2015a), Cerasa, lo Verde & Massa (2014a), Chinery (2011a), Cogolludo (1921a), Coulianos & Holmåsen (1991a), Dauphin & Aniotsbehere (1997a), Eady & Quinlan (1963a), Ecott (2012a), Hellrigl (2009a), Hellrigl & Bodur (2015a), Houard (1908a), Katılmış & Kıyak (2008a), Kemal & Koçak (2010a), Koops (2013a), Kwast (2014a), Meika (2006a), Melika, Csóka & Pujade-Villar (2000a), Nieves-Aldrey (1983a, 1998a, 2001a), Redfern & Shirley (2011a), Roskam (2009a), Tavares (1905a), Tomasi (2003a, 2012a, 2014a), Wiebes-Rijks (1976a), Williams (2010a).