Genus: Cimbex Olivier, 1790
Common name: cimbicid sawflies
Cimbex is a genus of large-bodied sawflies in the family Cimbicidae. They are relatively uncommon and little-studied in North America. Their large size and yellow- and black-striped coloration in at least one species resembles species of yellowjackets in the genus Vespula.
Cimbex species are only found in Eurasia and North America. Four species occur in North America (Taeger et al. 2010).
The distribution of Cimbex sp. by GBIF: https://www.gbif.org/species/1249709
There are 17 species of Cimbex.
Larval Cimbex feed on leaves of elm (Ulmus), maple (Acer), birch (Betula), willow (Salix), basswood (Tilla), alder (Alnus), cottonwood (Populus), hop-hornbeam (Ostrya), and honeysuckle (Lonicera). Adults girdle bark on twigs during feeding and oviposition (Smith, 1993). These sawflies are not generally considered a forestry problem, but they can defoliate elms and willows when population numbers are high (Stein 1974).
Larval Cimbex feed on foliage and are often confused with caterpillars. When disturbed, they react by excreting a clear defensive liquid, then falling to the ground. Once the larvae are mature, they will also drop to the ground where they will build a cocoon in the leaf litter. Larvae overwinter as prepupae and pupate in spring (Milne and Milne 1980; Harizanova et al. 2012).
Adult Cimbex typically fly from May to August. They damage trees to cause them to exude sap which the adults will feed on. Though Cimbex americana is a native species, it can cause significant damage to elm and willow trees if there are a large number of larvae feeding on the same tree (Stein 1974).
Palaeocimbex quadrimaculatus (Müller) can be a destructive pest of almond trees in the Mediterranean and southwestern Asia. There are currently no North American records of this species (Bolu 2016).