Andricus solitarius (Fonscolombe, 1832)

on Quercus, agamous generation

Andricus solitarius FF very young gall on Quercus robur

Quercus robur, Raalte © Arnold Grosscurt: very young gall

Andricus solitarius FF very young gall on Quercus robur

section

Andricus solitarius FF young gall on Quercus robur

older gall

Andricus solitarius FF young gall on Quercus robur

section

Andricus solitarius: bud gall on Quercus

Quercus sp., France, dépt. Ardennes, Givet, lieu-dit “Fort Condé”, leg Sébastien Carbonnelle © Stéphane Claerebout

Andricus solitarius FF: gall on Quercus robur

Quercus robur, Dronten, de IJslander © Arnold Grosscurt

Andricus solitarius gall

Quercus petraea, Belgium, prov. Hainaut, Thuin, Bois de la Frégène, early June: gall still quite young; © Jean-Yves Baugnée

Andricus solitarius gall

another specimen

Andricus solitarius opened gall

same gall, opened; there is no differentiated gall chamber

Andricus solitarius gall

Quercus robur, Ackerdijk; © Ben van As (late August)

Andricus solitarius old gall (with A. lignicolus)

Quercus robur, Dronten; old gall, with gall of A. lignicolus © Arnold Grosscurt

gall

Mostly solitary pear-shaped gall, generally developed from an axil bud; the upper part drawn into a lang and slightly curved point. Fresh galls with much long, rust-red hair, but later the hairs disappear. At the base of the gall bud scales remain visible. May-September, mature in July.

hostplants

Fagacae, monophagous

Quercus petraea, pubescens, pyrenaica, robur.


on Quercus, sexual generation

Andricus solitarius: sexual stage gall on Quercus robur

Quercus robur, Belgium, prov. Antwerp, Retie, Prinsenpark © Carina Van Steenwinkel

Andricus solitarius: sexual stage gall on Quercus robur

the gall develops while the catkin is still immature

Andricus solitarius: sexual stage gall on Quercus robur

the catkin below the gall degenerates

gall

Catkin gall. Thin-walled, less than 3 mm, oval, smooth or short-hairy gall at the tip of an aborted catkin; at the foot some long hairs and failed anthers. Lengthwise two ridges run from bottom to tip, one at each side, meeting each other at the tip. Galls are mature in May.

hostplants

Fagacae, monophagous

Quercuscerris, petraea, pubescens, pyrenaica, robur.

synonyms

Andricus occultus Tschek, 1871; villarubiae, Tavares, 1930.

inquilines

Synergus gallaepomiformis.

references

Béguinot (2001c,f, 2002a, 2003a, 2006c, 2007b, 2008a, 2012a), Bellmann (2012a), Buhr (1965a), Cerasa (2015a), Chinery (2011a), Cogolludo (1921a), Dauphin & Aniotsbehere (1997a), Eady & Quinlan (1963a), Groom (2011a), Hellrigl (2009a, 2010a, 2012a), Hellrigl & Bodur (2015a), Houard (1908a), Katılmış & Kıyak (2008a), Kemal & Koçak (2010a), Kollár (2011a), Koops (2013a), Kwast (2012a, 2014a), Lambinon, Carbonnelle & Claerebout (2015a), Lambinon, Schneider & Chevin (2003a), Marković (2014a, 2015a), Melika (2006a), Melika, Csóka & Pujade-Villar (2000a), Nieves-Aldrey (1093a, 2001a), Nieves-Aldrey, Gómez, Hernández Nieves & Lobo (2006a), Pujade-Villar (2005b), Pujade-Villar, Kwast, Thuroczy & Bellido (2002a), Redfern & Shirley (2011a), Roskam (2009a) Schneider (2016a), Stănescu (2009a), Tomasi (2014a), Wiebes-Rijks (1976a), Williams (2010a).

mod 15.vi.2018