Euura herbaceae (Cameron, 1876)

Euura herbaceae - viminalis group (formerly Pontania herbaceae)

See Liston et al (2017) for determination of adults. The host plant is an upland species.

Larvae feed on dwarf willow forming a pea gall, in contact with the midrib, projecting about equally above and below the leaf-blade. The gall is smooth and without hairs. The galls cannot be distinguished from those of Euura aquilonis. The larvae have three annulets on abdominal segments one to eight (four in aquilonis).

Size: Female: 2.8 - 4.4mm, male: 3.2 - 4.6mm

Status: Rare

Distribution: England, Scotland, Wales, Ireland

Flight period: Univoltine

Plant associations: Salix herbacea (dwarf willow)

References:

Benson, R.B., 1952. Handbooks for the Identification of British Insects. Hymenoptera, Symphyta, Vol 6, Section 2(a-c), Royal Entomological Society, London

Liston, A.D., Heibo, E., Prous, M., Vårdal, H., Nyman, T. and Vikberg, V., 2017. North European gall-inducing Euura sawflies (Hymenoptera, Tenthredinidae, Nematinae). Zootaxa, 4302(1), pp.1-115.

Liston A, Knight G, Sheppard D, Broad G, Livermore L (2014) Checklist of British and Irish Hymenoptera - Sawflies, ‘Symphyta’. Biodiversity Data Journal 2: e1168. https://doi.org/10.3897/BDJ.2.e1168