Andricus hartigi (Hartig, 1843)

on Quercus

Andricus hartigi: gall on Quercus robur, w transv. section

Quercus robur gall, with at right a schematic transverse section (from Houard, 1908a)

Andricus hartigi on Quercus pubescens

Quercus pubescens, France, leg Benoît Huc © Sébastien Carbonnelle

gall

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.

hostplants

Fagaceae, monophagous

Quercus frainetto, petraea, pubescens, pyrenaica, robur.

synonyms

Cynips hartigi.

notes

The sexual generation could be Andricus cydoniae (Stone ao, 2008a).

references

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).