Pachypappa populi (Linnaeus, 1758)

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 : 25

Pachypappa populi (Linnaeus, 1758)

Fig. 19 A, F ; 20

Diagnosis

Apterae 1–2 mm, pale yellowish with wax tufts posteriorly. Cells in abdominal wax gland plates with a small central spot ( Fig. 19A ). Segments 1 and 2 of tarsi less distinctly separated than in P. tremulae (Linnaeus, 1761) and P. vesicalis Koch, 1856 . Legs longer, hind femur more than 4 × its maximum width. Antennae usually 6-segmented, PT finger-like. Spines at apices of tibiae weak, not much stronger than the hairs on first tarsal segment. Hind tibia on dorsal side bearing 2–5 spine-like hairs with short, blunt apices. Dioecious. Alternating between Populus tremula (Salicaceae) and Picea abies roots ( Pinaceae ), where wax-covered colonies are formed. Anholocyclic hibernation occurs.

Distribution

F N S. See also Carter & Danielsson (1991).

Figures

Fig. 19. Gootiella, Pachypappa and Pachypappella. Apt. alienicolae (born on secondary host). A–B. Spinal wax gland on abd. terg. 6 of Pachypappa populi (Linnaeus, 1758) (A) and P. vesicalis Koch, 1856 (B). C. Hind leg of Gootiella tremulae Tullgren, 1925. D–G. Hind tibia and tarsus of Pachypapella lactea (Tullgren, 1909) (D), Pachypappa tremulae Tullgren, 1925 (E), P. populi (Linnaeus, 1758) (F) and P. vesicalis Koch, 1856 (G). A–B and D–G after Carter & Danielsson 1991, C after Danielsson 1990b. All modified.

Fig. 20. Pachypappa populi (Linnaeus, 1758). Apt. from mycorrhizal Picea abies root in the moor layer of a shady spruce forest.