Janus cynosbati (Linnaeus, 1758)

oak twig borer

on Quercus

gall

inconspicuous, fusiform swelling of about a cm long in the upper part of a young shoot; the part of the shoot above is wilting. Inside a single sawfly caterpillar or its pupa.

host plants

Fagaceae, narrowly monophagous

Quercus petraea, pubescens, robur.

synonyms

Janus femoratus (Curtis, 1830).

references

Beneš & Holuša (2015a), Buhr (1965a), Burggraaf-van Nierop & van Achterberg (1990a), Chevin, Savina & Garrin (2015a), Hellrigl (2010a), Pschorn-Walcher & Altenhofer (2000a, 2006a), Schwarz (1999a), Taeger, Altenhofer, Blank, ao (1998a).