In 2010, Pentamerismus taxi (Haller, 1877) was revealed in the Acad. O. V. Fomin Botanical Garden (Kyiv). Th is is the northernmost border (51˚31′N) of expansion of this phytophage in Ukraine. Th e mite most severely infests Taxus baccata L. plants and all varieties of this species. Th is mite has not been found on the plants of T. canadensis March. and T. cuspidata Siebold et Zucc. ex Endl. Appearance of a new dangerous pest requires further close study of this species.