Diagnosis based on Heie (2004). Apterae 1.8–2.7 mm, pale, wax-covered. Very similar to P. bumeliae, but the posterior wax gland plates on head weakly developed, sometimes absent. Dioecious, alternating between Fraxinus excelsior ( Oleaceae) and roots of Abies ( Pinaceae), where wax-covered colonies are formed.
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