Phytophthora alni subsp. uniformis Found in Alaska Beneath Thinleaf Alders

Abstract

Phytophthora alni Brasier & S. A. Kirk 2004 is an emergent pathogen causing a lethal root and collar disease of alder species in Europe. The species has not been previously found in North America, although an isolate tentatively referred to as P. alni was reported in a survey of nurseries in Minnesota. The potential establishment and spread of this complex of pathogens is perceived to represent a threat to all species of Alnus in the western hemisphere. Accepted for publication 2 October 2008. Published 12 December 2008.