Tetraneura ulmi (Linnaeus, 1758)

on Ulmus

Tetraneura ulmi: gall on Ulmus glabra

Ulmus glabra, Zeewolde, Harderbos © Hans Jonkman

Tetraneura ulmi: galls on Ulmus glabra

exaggerated

Tetraneura ulmi: very young vall

Ulmus x hollandica, Biddinghuizen, Spijk- en Bremerbergbos © Hans Jonkman: two very young galls in an already extensively disfigured leaf (May 3)

Tetraneura ulmi: very young gall

same leaf, eight days later; one of the two galls has been aborted

Tetraneura ulmi gall

Ulmus minor, Belgium, prov. Liège, Hergenrath, Hohnbach © Jean-Yves Baugnée; jonge gal

Tetraneura ulmi

Ulmus minor, Amsterdam, Vliegenbos: openings in the old gall

Tetraneura ulmi

when the gall is sliced open the inside is hidden by a dense tuft of wax threads

Tetraneura ulmi

after removal of the wax the winged and apterous aphids are visible

Tetraneura ulmi: gall

Ulmus, Belgium, prov. Namur, Vierves-sur-Viroin, RN Mine de Barytrine © Stéphane Claerebout

Tetraneura ulmi: gall

this gall did not contain hardly any wax

Tetraneura ulmi: young or failed gall

Ulmus, Zwolle © Arnold Grosscurt: young (failed?) gall.

Tetraneura ulmi: underside of a galled leaf

underside of the galled region.

Tetraneura ulmi: old gall on Ulmus glabra

Ulmus glabra, Zeewolde, Harderbos © Hans Jonkman: in mid-July the galls are vacated and withered; the leaf itself remains green.

Tetraneura ulmi: gall on Ulmus glabra

Ulmus glabra, Zeewolde, Harderbos © Hans Jonkman. This picture was taken on August 8th, 2015, at a date that other galls of this species were completely withered: an enigmatic late appearance of the spring generation.

Tetraneura ulmi: gall on Ulmus glabra

same plant and locality, September 18th!

primary hostplants

Ulmaceae, narrowly monophagous

Ulmus minor, glabra.

Rarely on U. davidiana, laevis.

notes

the effect of the galling extends far beyond the gall itself, as yellow spots at the upperside of the leaf, and as an extensive hairiness at the underside. Possibly this hypophyllous “erineum” has created the suggestion of the work of a gall mite (Buhr’s # 7325 “unresolved gall mite”).


on Poaceae

gall

From the second half of the summer apterae live on the roots of various grasses.

secondary hostplants

Poaceae, oligophagous

“Agropyron”, Bromus, Dactylis, Deschampsia, Festuca, Holcus, Hordeum, Lolium, Poa, Zea ……

synonyms

Byrsocrypta ulmi; B. personata Börner, 1950.

references

Béguinot (2001c, 2002d, 2003a, 2006c, 2012a), Bellmann (2012a), Blackman & Eastop Braggion (2013a), Buhr (1965a), Carter & Danielsson (1993a), Chinery (2011a), Cogolludo (1921a), Coulianos & Holmåsen (1991a), Dauphin & Aniotsbehere (1997a), Deckert & Deckert (2016a), Dietrich (2016a), Ecott (2012a), Heie (1980a), Hellrigl (2004a), Ilie & Marinescu (2011a), Kollár (2011a), Koops (2013a), Kowalski (2004a), Lambinon & Schneider (2004a), Lampel & Meier (2003a), Lehmann & Flügel (2012a), Lehmann & Hannover (2016a), Pellizzari (2010a), Pérez Hidalgo & Umaran del Campo (2013a), Rakauskas & Trukšinaitė (2011a), Redfern & Shirley (2011a), Roskam (2009a), Salas-Remón, Llimona, Lozano ao (2015a) Stefănescu (2009a), Sylvén (1960a), Tambs-Lyche & Heie (1994a), Tomasi (2003a, 2012a), Walczak, Borowiak-Sobkowiak & Wilkaniec (2017a).

12/05/2017

pub 23.v.2017 · mod 26.vii.2017