Recorded widely throughout much of mainland Britain to northern Scotland (Musgrove, 2023).
An mostly black insect. The third antennal segment about as long as the fourth and fifth combined. For the most part, the legs are black though the fore tarsi, and sometimes the mid tarsi, are paler. Males are very rare.
Caliroa cerasi larvae are mucus covered " slugworms" that feed initially on the upperside of leaves. Pear and cherry are preferred. They pupate in the ground and emerge after 2-3 weeks, or overwinter to emerge the following May.
Size: 4 - 6mm
GB IUCN Status: Least Concern
GB Rarity Status: None
Distribution: England, Scotland, Wales, Ireland
Flight period: Bivoltine, May to September
Plant associations: Polyphagous, especially on Pyrus spp. and Prunus spp. (various trees and shrubs esp. pears and cherries.)
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
Musgrove, A.J. 2023. A review of the status of sawflies of Great Britain - Phase 2: The Athaliidae and the Tenthredinidae (excluding Nematinae). Natural England, unpublished