Euura samolad - viminalis group (formerly Pontania samolad)
See Liston et al (2017) for determination of adults. The host plant is an upland species. Within this group, males of Euura aquilonis, crassipes, collectanea, myrsiniticola, pedunculi, saliciscinereae, samolad, viminalis, herbaceae and arbusculae are inseparable.
Euura samolad larvae feed on Downy willow and its hybrid with Tea-leaved willow. The gall is in contact with the midrib, projecting only below the leaf-blade. The pea shaped gall is often rather small with dense, aspressed hair, without warts and green to bright red.
Size: Female: 3.2 - 6.2mm, male: 2.7 - 4.8mm
Flight period: Univoltine
Plant associations: Salix lapponum and Salix lapponum x phylicifolia (Downy Willow and its hybrid with Tea-leaved Willow)
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