Plant Parasites of Europe

leafminers, galls and fungi

Oberea linearis

Oberea linearis (Linnaeus, 1761)

hazelnut and walnut twig borer

on Corylus, etc.

gall

According to Buhr, the female deposits her eggs individually under the bark of a young shoot, then rings the shoot a few centimeters higher up; this causes the development of a gall-like callus which serves as the first food for the larva. The part of the shoot above the ring withers and dies off. Later, the larva bores a long tunnel descending in the twig, now and then making an opening to discard frass. However, according to Tzanakakis and others, the larva itself is responsible for the shoot’s die-off because the very first part of its tunnel is a circular gallery, perpendicular to the shoot.

host plants

polyphagous on woody plants

Alnus; Carpinus betulus; Corylus avellana, colurna; Juglans regia; Ostrya; Ulmus.

notes

a pest in commercial hazel growing.

references

Buhr (1964a), Burgers (2021a), Contarini (2015a), Funke (1985a), González Peña, Vives i Noguera & de Sousa Zuzarte (2007a), Hellrigl (2010c), Marras, Loru & Pantaleoni (2009a), Sláma (1998a), Vitali (2018a).

Last modified 28.ix.2021