Clethrobius comes (Walker, 1848)

brown hairy birch-aphid

on Alnus, Betula

UK © Bob Dransfield & Bob Brightwell, InfluentialPoints

parasiet

All adults are alate; they are large (3-6 mm), dark brown, hairy. The live on branches of two years or older, often high in the crown or on branches overhanging water.

host plants

Betulaceae, oligophagous

Alnus glutinosa, incana, viridis; Betula papyrifera, pendula, pubescens.

synonyms

Betacallis, Clethrobius, giganteus (Cholodkovsky, 1899)
Population on Alnus are sometimes distinguished as a separate species, viz. Clethrobius giganteus. Indeed all attempts of transplantation towards birch did fail. However, because morphologically the populations agree even in minute details they generally are considered conspecific.

references

Blackman & Eastop (2017), Börner & Franz (1956a), Danielsson (1974a), Heie (1982a), Hellrigl (2004a), Lampel (1988a), Lampel & Meier (2003a), Müller & Horatschek (1980a), Nieto Nafría & Mier Durante (1998a), Osiadacz & Wojciechowski (2008a), Petrović (1998a), Stroyan (1977a), Tambs-Lyche & Heie (1984a), Wieczorek & Kanturski (2011a), Wojciechowski, Depa, Halgoš ao (2016a).