Fenusa pumila Leach, 1817

Fenusa pumila

Males are rare. Antennae no longer than the thorax with the third segment twice as long as broad, but with the fourth and fifth segments each less than twice as long as broad.

Larvae mine the leaves of birch trees with a preference for hairy birch.

 

Size: 2.5 - 3.5mm

Status: Common

Distribution: England, Scotland, Wales, Ireland

Flight period: Bivoltine, May to June and July to August.

Plant associations: Betula spp. esp. Betula pubescens (birch esp. hairy birch)

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, 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