Plant Parasites of Europe

leafminers, galls and fungi

Aceria tenuis

Aceria tenuis (Nalepa, 1891)

on Poaceae

Aceria tenuis mites on Bromopsis erecta

Bromopsis erecta, Belgium, prov. Namur, Couvin, lieu-dit “Roche Albéric”, © Stéphane Claerebout

Aceria tenuis mites on Bromopsis erecta

The density of the mites can be very high.

Aceria tenuis on Dactylis gomerata

Dactylis glomerata, Zeewolde, Harderbos © Hans Jonkman

Aceria tenuis: gall of Bromus spec.

Bromus spec., Belgium, prov. Luxembourg, Tellin, Tienne des Vignes © Carina Van Steenwinkel

Aceria tenuis: gall of Bromus spec.

old gall

Aceria tenuis: galls of Bromus spec.


Aceria tenuis: immature mite

mite (immature; adults a much more slender)

Aceria tenuis: galling inflorescence of Apera spica-venti

Apera spica-venti, Brummen, Hall © Arnold Grosscurt

Aceria tenuis: galling inflorescence of Phleum pratense

Phleum pratense, Belgium, prov. Namur, Dourbes © Stéphane Claerebout

Molinia caerulea, Belgium, prov Liège, Chaudfontaine, Bois de la Rochette © Jean-Yves Baugnée

cf Aceria tenuis: gall on Elytrigia repens

Elytriga repens, Zeewolde, Harderbos © Hans Jonkman


Poaceae, oligophagous

Aeluropus littoralis; Agrostis capillaris, stolonifera; Alopecurus pratensis; Anisantha madritensis, sterilis, tectorum; Anthoxanthum odoratum; Apera spica-venti; Avena sativa; Avenella flexuosa; Avenula pubescens; Brachypodium pinnatum; Briza media; Bromopsis benekenii, erecta, inermis; Bromus arvensis, commutatus, hordeaceus, racemosus, secalinus; Calamgrostis arundinacea, canescens, epigeios, neglecta, purpurea & subsp. phragmitoides; Cynosurus cristatus; Dactylis glomerata; Danthonia decumbens; Deschampsia cespitosa; Elytrigia repens; Festuca arenaria, rubra; Glyceria fluitans; Helictochloa pratensis; Holcus lanatus; Hordeum murinum, vulgare; Leymus arenarius; Lolium perenne; Milium effusum; Molinia caerulea; Phalaroides arundinacea; Phleum pratense, phleoides; Poa angustifolia, compressa, pratensis & subsp. irrigata; Schedonorus arundinaceus, pratensis; Sesleria caerulea; Setaria viridis; Triticum aestivum.


the mites live in the length grooves of the grass leaves; on grasses with smooth leaves they are much less numerous. At high densities rolling and withering of the leaves does occur, also growth disturbance, malformations and discolouration of the inflorescence.


Eriophyes tenuis.


galls like those illustrated above are traditionally attributed to Aceria tenuis in the cecidological literature. However, there are a number of gall mite species more that live on grasses that at high densities probably may cause developmental disturbances.
Buhr and Roskam mention a Aceria tenuis subsp. lissa. This is based on a line in Jaap (1918a) referring to a galling of Molinia caerulea by “Eriophyes tenuis var. lissus Nalepa in litt.” Apparently this variety has never been described.


? Aceria cornuta, Aculodes dubius.


Arthrocnodax spec.


Boczek & Petanović (1996a), Buhr (1964b, 1965a), Carbonnelle, George, Giot & Romain (2018a), Dauphin & Aniotsbehere (1997a), Farkas (1965a), Houard (1908a), Jaap (1918a), Jočić & Petanović (2012a), Koops (2013a), Kozlowski (2001a), Petanović & Stanković (1999a), Redfern & Shirley (2011a), Ripka (2007a), Roivainen (1947a, 1950a, 1951a), Roskam (2009a), Skoracka (2004a), Skoracka, Lewandowski & Boczek (2005a), Stănescu (2009a), Tomasi (2003a, 2012a, 2014a), Weidner (1954a).

Last modified 19.iv.2024