Plant Parasites of Europe

leafminers, galls and fungi

Clethrobius comes

Clethrobius comes (Walker, 1848)

brown hairy birch-aphid

on Alnus, Betula

Clethrobius comes

UK © Bob Dransfield & Bob Brightwell, InfluentialPoints


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.


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.


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).

Last modified 15.i.2019