Andricus seminationis (Giraud, 1859)

on Quercus

Andricus seminationis: gall on Quercus robur

Quercus robut, België, prov. Namen, Étang de Virelles © Stéphane Claerebout

Andricus seminationis: gall on Quercus sp.

detail

Andricus semnationis: gall on Quercus robur

Qercus robur, Loenen (Gld) © 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).

mod 15.vi.2018