Plant Parasites of Europe

leafminers, galls and fungi

Andricus seminationis

Andricus seminationis (Giraud, 1859)

on Quercus

Andricus seminationis gall

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

Andricus seminationis gall

Quercus robur, Belgium, prov. Limbourg, Maasmechelen, 12.v.2018 © Carina Van Steenwinkel: young galls

Andricus seminationis gall

Quercus robur, Belgium, prov. Antwerp, Meerhout, Keyfheide, 9..v.2015 © Carina Van Steenwinkel: older galls – unstalked, presumably parasitised

Andricus seminationis gall

Quercus robur, Belgium, prov. Antwerp, Balen, Scheps, 7.vi.2015 © Carina Van Steenwinkel: mature galls

Andricus seminationis gall

detail

Andricus seminationis gall

Quercus spec., Belgium, prov. Limbourg, Nieuwerkerken, Schelfheide, 12.x.2019 © Carina Van Steenwinkel: old (date!), parasitised gall

Andricus seminationis: gall on Quercus robur

Quercus robur, België, prov. Namen, Étang de Virelles, 9.vi.2015 © Stéphane Claerebout

Andricus seminationis: gall on Quercus sp.

detail

Andricus semnationis: gall on Quercus robur

Quercus robur, Loenen (Gld), 1.vi.2017 © Arnold Grosscurt: older gall

Andricus semnationis: gall on Quercus robur

another specimen

Andricus seminationis leaf gall

leaf gall (from Houard, 1908a)

gall

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.

hostplants

Fagaceae, monophagous

Quercus petraea, pubescens, robur.

notes

Only the agamous generation is known.

references

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).

Last modified 29.iv.2020