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).