Janetia cerris (Kollar, 1850)

on Quercus

Quercus cerris, galls (from Houard 1908a)

Quercus cerris, Hungary, Budapest, Hűvösvölgy, 29.viii.2018 © László Érsek

underside

upper side of a gall

underside of a gall

underside of a gal

transverse section through an occupied gall

horizontal section through an occupied gall

larva, dorsal

larva, ventral

gall

Acutely conical gall, that with its narrow smooth top extends c. 2 mm above the upperside of the leaf. The base, that protrudes for 1 mm from the underside, is disk-shaped and covered with a fine yellow felt. At maturity of the gall this base falls off. Often many galls on a leaf. The solitary larva is orange red. Univoltine; pupation in the soil.

hostplants

Fagaceae, narrowly monophagous

Quercus “aegilops”, cerris, dalechampii, x hispanica, infectoria subsp. veneris, ithaburensis subsp. macrolepis, libani, suber, trojana.

larva

see also Skuhravý & Skuhravá (1971a)

prosternum with spatula (from Möhn, 1955a)

synonyms

Cecidomyia, Arnoldia, cerris.

inquilines

See Saphonecrus haimi and Synergus variabilis.

references

Buhr (1965a), Cerasa (2015a), Cilbircioğlu & Ünal (2009a), Cogolludo (1921a), Csóka (2012a), Gagné (2010a), Hellrigl (2010a), Houard (1908a), Möhn (1955a), Roskam (2009a), Roskam & Carbonnelle (2015a), Simova-Tošić & Skuhravá (2001a), Simova-Tošić, Skuhravá & Skuhravý (1996a, 2000a, 2004a, 2007a), Simova-Tošić, Skuhravá, Skuhravý & Postolovski (2007a), Skrzypczyńska (2007a), Skuhravá, Bayram, Çam ao (2005a), Skuhravá & Skuhravý (1994a, 1997b, 1999a), Skuhravá, Skuhravý & Dengler (1997a), Skuhravá, Skuhravý, Dončev & Dimitrova (1991a, 1992a), Skuhravá, Skuhravý & Massa (2007a), Skuhravá, Skuhravý & Meyer (2014a), Skuhravá, Skuhravý & Neacsu (1972a), Skuhravá, Skuhravý, Skrzypczyńska & Szadziewski (2008a), Skuhravý & Skuhravá (1971a), Stănescu (2009a), Unal & Akkuzu (2009a).