Populus alba, Hungary, Mosonmagyaróvár © László Érsek
concentration of (fused) galls near the leaf base
as this section shows, the mine protrudes at upperside and underside of the leaf to the same degree
two larvae. According to Dr. Skuhravá the left one belongs to Contarinia populi; see the note below.
drawing by Wachtl, the author of the species (from Wachtl, 1886a)
± smooth, unilocular swelling of the lamina, equally protruding at both sides; often several galls fused near tha base of the leaf. Larva solitary, orange, not jumping. Univoltine, pupation in the soil.
Populus alba, x canescens, tremula.
according to the description by Wachtl, the gall has an inner gall – a phenomenon common in gall wasps, unique among gall midges. Below the, perhaps somewhat diagrammatic, illustration given by him. The two lower pictures showing hand-section made by László confirm the impression that the inner gall is funnel-shaped and open above. That is in agreement with the many upper-surface openings in the -still occupied- galls in the pictures and in the drawing. Actually the larva does not live in the funnel but around it. The way the funnel evolves, and it’s function, are unclear; probably the oviposition plays a central role.
section through some gall, showing the inner gall Wachtl (1886a)
section through a gall
section through a gall
Under the name of Contarinia populi Skuhravý, Skuhravá & Brewer depict a gall that clearly belongs to L. populnea, as conceived above. This is because according to several authors populnea is but an inquiline of Contarinia populi and Harmandiola species (Skuhravá & Skuhravý, 2012a). How this can be reconciled with the observations by Wachtl is not clear.
Barnes (1951a), Buhr (1965a), Cilbircioğlu & Ünal (2009a), Cogolludo (1921a), Gagné (2010a), Lambinon, Carbonelle & Claerebout (2015a), Lambinon, Schneider & Feitz (2001b, 2012a), Redfern & Shirley (2011a), Roskam (2009a), Roskam & Carbonelle (2015a), Simova-Tošić & Skuhravá (2001a), Simova-Tošić, Skuhravá & Skuhravý (1996a, 2000a, 2004a, 2007a), Simova-Tošić, Skuhravá, Skuhravý & Postolovski (2007a), Skuhravá (2011a), Skuhravá, Bayram, Çam ao (2005a), Skuhravá & Skuhravý (1999a, 2012a), Skuhravá, Skuhravý, Blasco-Zumeta & Pujade-Villar (2006a), Skuhravá, Skuhravý & Carbonnelle (2017a), Skuhravá, Skuhravý, Dauphin & Coutin (2005a), Skuhravá, Skuhravý & Meyer (2014a), Skuhravá, Skuhravý & Neacsu (1972a), Skuhravá, Skuhravý, Skrzypczyńska & Szadziewski (2008a), Skuhravý, Skuhravá & Brewer (1997a), Tomasi (2014a), Unal & Akkuzu (2009a), Wachtl (1886a), Wahlgren (1963b).