Euura proxima (Serville, 1823)
Salix x fragilis, Millingerwaard. Galls on sunny leaves have their upperside often wine red.
Salix alba, Nieuwendam: upperside
Salix x fragilis, Nieuwendam; the young larva is remarkably small compared to the size of the gall
Salix alba, Nederhorst den Berg; larva
terminal abdomen segments
Salix alba, Vreeland, Lambertskade: galls form a breeding ground for fungi
Up to 20 galls in a leaf; they are bright reddish above, yellow or pink below. The surface usually covered with small ridges or protuberances. Generally bivoltine.
Salix alba, x blanda, bablyonica, x fragilis, excelsa, pentandra.
In a botanical garden also Salix nigra (Groom).
Third abdominal segment with 4 dorsal annulets. Suranal plate with widely spaced pseudocerci.
Member of the Euura proxima species group.
Normally the underside of the galls is more or less smooth and cylindrical. Contrariwise, the pictures below show a leaf where the undersides of the galls are conicical, apparently with a pore at the tip. On the internet several more pictures can be found with similar galls, indicating that it is not an isolated phenomenon. An explanation cannot be given. On opening of the galls no inquilines were found.
Salix x fragilis, Haren 19.viii.2017 © Arnold Grosscurt<
same leaf, underside
Abras, Fassotte, Chandelier & Cavelier (2008a), Altenhofer, Hellrigl & Mörl (2001a), Béguinot (2001c, 2002d,e,f,h, 2003a, 2005a, 2006a,c, 2007b, 2012a), Bellmann (2012a), Beneš (2015a), Braggion (2013a), Buhr (1965a), Chinery (2011a), Cogolludo (1921a), Coulianos & Holmåsen (1991a), Dauphin & Aniotsbehere (1997a), Deckert & Deckert (2016a), Flügel (2016a), Groom (2011a), Haris (2009a), Hellrigl (2004b), Houard (1908a), Ilie & Marinescu (2011a), Kollár (2011a), Koops (2013a), Kopelke (1999a, 2005a), Lehmann & Flügel (2012a), Lehmann & Hannover (2016a), Liston, Heibo, Prous ao (2017a), Mol (2013a), Perović, Merdić & Perović (2006a), Pschorn-Walcher & Altenhofer (2000a), Redfern & Shirley (2011a), Roskam (2009a), Savina & Chevin (2012a), Tomasi (2003a, 2014a).