Euura testaceipes - amerinae group
See Liston et al (2017) for determination of adults. The main host plants are widespread species.
Larvae feed on leaves of white willow, crack willow (or hybrids thereof) and almond willow causing a spindle shaped swelling in the midrib or leaf petiole. Sometimes more than one gall per leaf.
Size: Female: 3.8 - 4.7mm, male: approx. 3.2mm
Status: Rare
Distribution: England, Scotland
Flight period: Univoltine
Plant associations: Salix alba, Salix fragilis and Salix triandra (white willow, crack willow and almond 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