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.
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)
The National Biodiversity Network records are shown on the map below. (See terms and conditions)
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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