Andricus hartigi (Hartig, 1843)
Quercus robur gall, with at right a schematic transverse section (from Houard, 1908a)
Quercus pubescens, France, leg Benoît Huc © Sébastien Carbonnelle
Gall derives from a dormant bud on the stem or the underside of a thick branch. The gall itself is unilocular, rotund and pea-sized. However, it is completely hidden by some 30 processes, each consisting of a narrow stalk, followed by a broad cone that ends in a slender curved spine. The gall therefore has the appearance of a heavily spinose walnut.
Quercus frainetto, petraea, pubescens, pyrenaica, robur.
The sexual generation could be Andricus cydoniae (Stone ao, 2008a).
Buhr (1965a), Hellrigl (2009a), Hellrigl & Bodur (2015a), Houard (1908a), Katılmış & Kıyak (2008a), Kemal & Koçak (2010a), Marković (2014a, 2015a), Melika (2006a), Melika, Csóka & Pujade-Villar (2000a), Pellizzari (2010a), Shachar, Melika, Inbar & Dorchin (2018a), Stone, Atkinson, Rokas ao (2008a), Tomasi (2014a).