Calamagrostis epigejos, Belgium, prov. Namur, Romedenne © Sébastien Carbonnelle

aphid

Arrhenatherum elatius, Polen, Bialowieza © Sébastien Carbonnelle

the elongated aphids

gall

the aphids are unusually elongated, greyish green or dirty yellow, 2-3 mm long. No host plant alternation, seldom ant visits. The aphids often live in the inflorescences, that may become sticky by the honeydew, and subsequently blackened by sooty mould.

host plants

Poaceae, broadly oligophagous

Agrostis stolonifera; Alopecurus genniculatus, pratensis; Ammophila arenaria & subsp. arundinacea; Arrhenatherum; spec.; Avena sativa; Bromus; Calamagrostis arundinacea, epigeios, villosa; Corynephorus canescens; Deschampsia cespitosa; Elytrigia repens; Festuca; Glyceria fluitans; Holcus lanatus; Hordeum vulgare; Koeleria macrantha; Leymus arenarius, secalinus, Panicum spec.; Phleum pretense; Poa; Secale cereale; Setaria spec.; Triticum aestivum.

In the Iberian peninsula also on Carex acutiformis. The main host plant is Calamagrostis epigeios (Wieczorek).

references

Blackman & Eastop (2015), Börner & Heinze (1957a), Buhr (1964b), Heie (1982a), Mier Durante, Seco Fernández & Nieto Nafría (1989a), Nieto Nafría & de Benito Dorrego (1976a), Nieto Nafría & Mier Durante (1998a), Osiadacz & Wojciechowski (2008a), de la Peña, Vandomme & Frago (2014a), Pérez Hidalgo, Martínez Peláez & Nieto Nafría (2001a), Roskam (2019a), Stroyan (1977a), Tomasi (2014a), Vandegehuchte, de la Peña & Bonte (2010a), Wieczorek (2010a), Wojciechowski, Depa, Halgoš ao (2016a).