Trigonaspis megaptera (Panzer, 1801)
on Quercus, asexual generation
Quercus pubescens, Hungary, Kamaraerdő, 25.vii.2017 © László Érsek
detail
larva in opened gall
mouth parts
larva
Quercus robur, Biddinghuizen, Spijk- en Bremerbergbos, 12.x.2017 © Hans Jonkman
detail
Quercus robur, Tilburg, de Kaaistoep, 8.x.205
opened gall
Quercus robur, France, dép. Loiret, Pers-en-Gâtinais, 19.x.2017 © Eugène Vandebeulque
parasite
The galls occur only late in autumn (September-October), often when the leaves are colouring already. The thin-walled galls mostly are arranged in rows at the underside of the leaves, on the major veins. They are more or less reniform and have a characteristic yellowish green colour. At the end of the season they turn brown and become more or less globular.
host plants
Fagaceae, monophagous
Quercus frainetto, petraea, pubescens, pyrenaica, robur.
on Quercus, sexual generation
Quercus robur, Roggebotzand (Flevoland) © Hans Jonkman
Quercus robur, Vorden; © Arnold Grosscurt
gall
galls, often hidden by litter, from dormant buds at the foot of mature stems, but also of seedlings and suckers. They are up to a cm in size and have a waxy surface. The colour ranges from white over creme and pink to reddish brown. Galls from April-Juni, mature in May.
host plants
Fagaceae, monophagous
Quercus frainetto, petraea, pubescens, pyrenaica, robur.
synonyms
Trigonaspis renum, Hartig, 1840.
notes
The sexual generation cannot be distinguished from the one of Trigonaspis synaspis. At least in the Netherlands synaspis is much more rare than megaptera (Roskam).
inquilines
parasitoids, predators
Pediobius lysis; Torymus fastuosus.
references
Askew (1961b), Azmaz & Katılmış (2015a), Béguinot (2006a), Bellmann (2012a), Blanes-Dalmau, Caballero-López & Pujade-Villar (2017a), Buhr (1965a), Burton, Carbonnelle, Ellis & Schneider (2019a), Burton, Ellis & Schneider (2022a), Cerasa (2015a), Chinery (2011a), Cogolludo (1921a), Coulianos & Holmåsen (1991a), Dauphin & Aniotsbehere (1997a), Doğanlar (2017a), Eady & Quinlan (1963a), Hellrigl (2009a), Hellrigl & Bodur (2015a), Houard (1908a), Kollár (2007a, 2011a), Koops (2013a), Kwast (2012a, 2014a), Lambinon, Carbonnelle & Claerebout (2015a), Lehmann & Hannover (2016a), Máca (2012a), Meiklejohn (2005a), Melika (2006a), Melika, Csóka & Pujade-Villar (2000a), Mutun & Dinç (2014a), Nieves-Aldrey (2001a), Redfern & Shirley (2011a), Roskam (2009a). Tavares (1905a), Tomasi (2014a), Williams (2010a).