Andricus quercusramuli (Linnaeus, 1761)

on Quercus, agamous generation

Andricus quercusramuli FF gall on Quercus robur

Quercus robur, UK, Suffolk, Kelsale, 8.xi.2018 © Jeremy Bowdrey

Andricus quercusramuli gall on Quercus robur

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

Andricus quercusramuli: sexual generation galls on Quercus petraea

Quercus petraea, Hungary, Kimle, 24.v.2018 © László Érsek

Andricus quercusramuli: sexual generation galls

fresh galls

Andricus quercusramuli: sexual generation gall

other side

Andricus quercusramuli: sexual generation gall

individual gall chambers

Andricus quercusramuli: larva

a single gall chamber, with larva

Andricus quercusramuli: larva

detail

Andricus quercusramuli: larva

larve

Andricus quercusramuli: old sexual generation galls

older galls (same tree, 24.v.2018)

Andricus quercusramuli: old sexual generation galls

detail

Andricus quercusramuli: anther gall on Quercus pubescens

Quercus pubescens, Spain, Catalunya, prov. Barcelona, Palau Solià i Plegamans © Jordi Montobbio

Andricus quercusramuli: anther galls on Quercus pubescens

Quercus pubescens, Spain, Catalunya, prov. Barcelona, Cerdanyola: split gall © Jordi Montobbio

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

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), Tomasi (2003a, 2012a, 2014a), Wiebes-Rijks (1976a), Williams (2010a).

mod 4.ii.2019