Plant Parasites of Europe

leafminers, galls and fungi

Janus cynosbati

Janus cynosbati (Linnaeus, 1758)

oak twig borer

on Quercus


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.


Janus femoratus (Curtis, 1830).


Beneš & Holuša (2015a), Berland (1947a), 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).

Last modified 14.iv.2024