Hormaphis betulae (Mordvilko, 1901)

Albrecht, Anders Christian, 2015, Identification guide to Nordic aphids associated with mosses, horsetails and ferns (Bryophyta, Equisetophyta, Polypodiophyta) (Insecta, Hemiptera, Aphidoidea), European Journal of Taxonomy 145, pp. 1-55 : 19-20

Hormaphis betulae (Mordvilko, 1901)

Fig. 15

Diagnosis

Apterae 1–2 mm, pale yellow, circular, flat; older juveniles and adults on secondary host with marginal wax rim. Dioecious. Alternates between witch-hazel Hamamelis (Hamamelidaceae) and birch Betula

( Betulaceae ). Anholocyclic in Northern Europe, living on birch. Overwintering in the moss layer of mixed coniferous forests and bogs, and during the cold season seen in moss samples.

Distribution

F.

Figures

Fig. 15. Hormaphis betulae (Mordvilko, 1901). Apt. (ad. and juv.) on Betula pubescens.