Andricus glandulae (Hartig, 1840)
on Quercus, agamous generation
Quercus robur © Roelof Jan Koops
The axillary bud of a leaf is transformed into an obpyriform gall of about half a cm high, often coloured red. The gall has a cover of long, white or violet, adpressed hairs that are directed downwards. Mainly on young shoots in leaf axils.
Quercus petraea, pubescens, pyrenaica, robur.
Only rarely on Q. robur.
on Quercus, sexual generation
gall (from Eady & Quinlan, 1963a)
Quercus robur, Belgium, prov. Luxembourg, Durbuy, la vieille Briqueterie de Rome © Carina Van Steenwinkel: the remnant of a locule is still visible
catkin gall. Ovoid gall, less than 2 mm long, derived from a single anther; the gall is not hairy but the surface has a granular structure. The gall develops in the filament, which gives the gall a squat aspect and explains why it is broadly attached basally; the gall formation extends somewhat to the rachis of the catkin, that locally is swollen. Galls in May-June.
Quercus petraea, pubescens, robur.
Andricus xanthopsis von Schlechtendal, 1883.
Azmaz & Katılmış (2015a), Béguinot (2002f, 2007b), Bellman (2012a), Blanes-Dalmau, Caballero-López & Pujade-Villar (2017a), Buhr (1965a), Dauphin & Aniotsbehere (1997a), Eady & Quinlan (1963a), Hellrigl (2009a), Hellrigl & Bodur (2015a), Houard (1908a), Koops (2013a), Kwast (2014a), Meiklejohn (2005a), Melika (2006a), Melika, Csóka & Pujade-Villar (2000a), Mutun & Dinç (2014a), Nieves-Aldrey (2001a), Nieves-Aldrey, Gómez, Hernández Nieves & Lobo (2006a), Pujade (1986a), Redfern & Shirley (2011a), Roskam (2009a), Tavares (1905a), Tomasi (2014a), Wiebes-Rijks (1976a), Williams (2010a).