Illustrated identification guide to the Nordic aphids feeding on Conifers (Pinophyta) (Insecta, Hemiptera, Sternorhyncha, Aphidomorpha) Author Albrecht, Anders Christian text European Journal of Taxonomy 2017 2017-07-24 338 1 160 journal article 22023 10.5852/ejt.2017.338 be9f3ab9-3131-4e11-8d29-a94275ffaac9 2118-9773 3834349 86786AB1-4A1A-4A1E-B42B-53B73D66ED60 Adelges (Dreyfusia) merkeri (Eichhorn, 1957) Diagnosis Similar to A. nordmannianae . Neosistens: wax pore plates on inner margins of meso- and metathoracic spinal sclerites divided into 3–4 rounded areas, each with 3–8 pits. Total number of pits on the 10 central areas 26–63 (usually more than 40) ( Blackman & Eastop 1994 , 2014). Holocyclic and dioecious, alternating between Picea orientalis (p. 9) and Abies alba . Scattered on trunk and older branches, on all parts of seedlings. Not ant-attended. Recorded secondary hosts Pinaceae : Abies alba . Holman (2009) also lists A. nordmanniana . Distribution S.