Birch-specialist
Guides
Oncopsis flavicollis
Oncopsis flavicollis is a small leafhopper species in the family Cicadellidae, subfamily Eurymelinae. It exhibits sexual dimorphism and is strongly associated with birch trees (Betula spp.), on which it feeds. The species has been subject to taxonomic debate regarding whether populations on different birch species represent distinct biological species or host plant utilization polymorphism. Adults are active from late spring through early autumn.
Stigmella betulicola
Stigmella betulicola is a minute leaf-mining moth in the family Nepticulidae, with a wingspan of 3.4–4.6 mm. It is widely distributed across Europe and extends eastward into the Palearctic realm. The species produces two generations annually, with adults active in May and August. Larvae are specialized miners of birch leaves, feeding on several Betula species. Identification from similar Stigmella species requires examination of genitalia under microscopy.