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Species Caliroa cerasi - Pear Slug

Caliroa cerasi 2nd instar - Caliroa cerasi pear slug - Caliroa cerasi pear slug - Caliroa cerasi pear slug - Caliroa cerasi pear slug - Caliroa cerasi pear slug - Caliroa cerasi Look like pear sawflies - Caliroa cerasi Caliroa larva on pear tree - Caliroa cerasi
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Hymenoptera (Ants, Bees, Wasps and Sawflies)
No Taxon ("Symphyta" - Sawflies, Horntails, and Wood Wasps)
Family Tenthredinidae (Common Sawflies)
Subfamily Heterarthrinae
Tribe Caliroini
Genus Caliroa
Species cerasi (Pear Slug)
Other Common Names
Pear Sawfly, Cherry Slug, Pear & Cherry Slugworm
Explanation of Names
Caliroa cerasi (Linnaeus 1758)
adult 4-6 mm, larva up to 11 mm(1)(2)
native to Europe & w. Asia, adventive on all other continents(1)(3); in NA, widespread, mostly in n. US and so. Canada (map)(4)
In Canada adults emerge and fly in mid-June to late July, elsewhere as early as mid-May(5)
polyphagous on Rosaceae(3)
Life Cycle
parthenogenetic (males unknown in NA, rare in Europe), usually bivoltine in NA(2)
larvae feed on upper surface of leaves producing distinctive skeletonizing wounds(6)
Internet References
Species pages: anon.(5) | anon.(7)