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 Prociphilus (Stagona) xylostei (De Geer, 1773) Diagnosis Holocyclic and dioecious, alternating between Lonicera (Caprifoliaceae) and Picea . An anholocyclic population on Picea roots is upheld throughout the year. Not ant-attended. Recorded secondary hosts Pinaceae : Picea abies * , glauca , sitchensis ; Pseudotsuga menziesii . According to Holman (2009) also on Abies . Distribution D F N S.