Ulmus glabra, Delft, 20.vi.2012 © Ben van As

Ulmus spec., Belgium, prov. Limbourg, Maasmechelen, Maasbocht Geneuth, 4.vii.2029 © Carina Van Steenwinkel: splitted open gall

Ulmus spec., Belgium, prov. Limbourg, Meldert, Schurfert, 16.viii.2016 © Carina Van Steenwinkel: old gall

another image

gall

In late summer the galls turn brown and split open, releasing the winged aphids within. The gall does not drop, because also the twig bearing the galled leaf has been incorporated in the gall. The dried gall remains on the tree untill after the winter.

host plants

Ulmaceae, monophagous

Ulmus minor & subsp. canescens.

Much less often on U. glabra.

on Rosaceae, secondary host plants

gall

aphids on the thin roots.

host plants

Rosaceae, oligophagous

Crataegus “oxyacantha”; Cydonia oblonga; Pyrus communis.

synonyms

Schizoneura lanuginosa.

references

Barbagallo, Binazzi, Pennacchio & Pollini (2011a), Barbagallo & Massimino Cocuzza (2014a), Béguinot (2006c, 2012a), Bellmann (2012a), Blackman & Eastop (2014), Blanes-Dalmau, Caballero-López & Pujade-Villar (2017a), Börner & Franz (1956a), Buga, Zhorov, Leshchinskaya & Stekolshchikov (2016a), Buhr (1965a), Chinery (2011a), Chireceanu, Chiriloaie, Teodoru & Sivu (2015a), Cogolludo (1921a), Dauphin & Aniotsbehere (1997a), Heie (1980a), Hellrigl (2004a), Houard (1908a), Koops (2013a), Lambinon & Schneider (2004a), Lampel & Meier (2003a), Mier Durante, Seco Fernández & Nieto Nafría (1989a), Mifsud, Pérez Hidalgo & Barbagallo (2009a), Nieto Nafría & Mier Durante (1981a), Nieto Nafría, Mier Durante, Binazzi & Pérez Hidalgo (2002a), Pellizzari (2010b), Pérez Hidalgo, Martínez Peláez & Nieto Nafría (2001a), Pérez Hidalgo & Umaran del Campo (2013a), Petrović (1998a), Redfern & Shirley (2011a), Ripka, Reider & Szalay-Marzsó (1998a), Roques, Cleary, Matsiakh & Eschem (2017a), Roskam (2009a), Stănescu (2009a), Suay Cano & González Funes (1998c), Tavares (1905a), Tomasi (2003a, 2012a, 2014a), Wojciechowski, Depa, Halgoš ao (2016a).