Plant Parasites of Europe

leafminers, galls and fungi

Pediaspis aceris

Pediaspis aceris (Gmelin, 1790)

on Acer, agamous generation

Pediaspis aceris: agamous generation gall on Acer pseudoplatanus root

Acer pseudoplatanus, Belgium, East Flanders, Geraardsbergen @ Bart Uitterhaegen


Root gall, initially soft, later woody; larva solitary. Ripe gall in autumn; the wasps emerge in the autumn of the subsequent third year.

on Acer, sexual generation

Pediaspis aceris galls

Acer pseudoplatanus, Belgium, prov. Namur, Onoz © Jean-Yves Baugnée

Pediaspis aceris galls

another leaf

Pediaspis aceris galls

upperside of the leaf

Pediaspis aceris galls

galls may occur as well in the inflorescence

Pediaspis aceris FM: gall on Acer monspessuianum

Acer monspessulanum, Spanish Pyrenees, Huesca © Ben van As

Pediaspis aceris parasitised gall

Acer pseudoplatanus, Belgium, prov. Namur, Saint-Servais, Asty-Moulin © Jean-Yves Baugnée: parasitised gall

Pediaspis aceris: opened gall

Acer pseudoplatanus, France, dép. Dordogne, Saint-Cyprien, 2.v.2019 © Arnold Grosscurt: opened gall

Pediaspis aceris: opened gall

larva in the gall

Dichatomus acerinus gall

Acer pseudoplatanus, France, Isère, Rhône-Alpes, Les Abrets © Arnold Grosscurt. Normally the galls are thin-walled, with a proportionally large central space. In this case the gall has been taken over by the inquiline Dichatomus acerinus, that as it where has formed a gall within a gall.

Dichatomus acerinus gall

galls parasitised by Dichatomus acerinus

Pediaspis aceris: gall on shoot of Acer pseudoplatanus

Acer pseudoplatanus, België, prov. Vlaams-Brabant, Dworp, early Januari, 2014 © Pierre Kestemont: occasionally the galls are formed on the fruits or, like here, a young shoot

Pediaspis aceris: fruit gall on Acer pseudoplatanus

Acer pseudoplatanus, Belgium, prov. Namur, Huy, Vallon de la Solières © Stéphane Claerebout: fruit gall


Galls smooths, rounded, thin-walled, unilocular. Wasps emerge in the third year from the galls.

host plants

Sapindaceae, monophagous

Acer ? campestre, heldreichii, hyrcanum, monspessulanum, obtusatum, opalus, platanoides, pseudoplatanus, velutinum.


Pediaspis pseudoplatani Mayer, 1779; P. sorbi Tischbein, 1852.


Abras, Fassotte, Chandelier & Cavelier (2008a), Askew (1963a), Askew, Plantard, Gómez, ao (2006a), Azmaz & Katilmiş (2017a), Béguinot (2002e,h, 2003a, 2005a, 2006c, 2012a), Bellmann (2012a), Blanes-Dalmau, Caballero-López & Pujade-Villar (2017a), Buhr (1964b), Dauphin & Aniotsbehere (1997a), Doğanlar (2017a), Groom (2011a), Hellrigl (2009a), Hellrigl & Bodur (2015a), Houard (1909a). Katılmış & Azmaz (2017a), Kieffer (1901b), Koops (2013a), Kwast (2012a, 2014a), Lambinon, Carbonnelle & Claerebout (2015a), Lambinon, Schneider & Chevin (2003a), Melika (2006a), Nieves-Aldrey (2001a), Pellizzari (2010b), Pujade i Villar (1994a), Roskam (2009a, 2019a), Tomasi (2003a, 2014a).

Last modified 31.xii.2023