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Phytophthora x pelgrandis, a new natural hybrid pathogenic to Pelargonium grandiflorum hort.

     Julius Kühn Institute-Federal Research Center for Cultivated Plants, Institute for Epidemiology and Pathogen Diagnostics, Berlin-Dahlem, Germany

Wolfram F. Gerlach

     Plant Protection Agency Berlin, Germany

Tom Gräfenhan

     Agriculture and Agri-Food Canada, Eastern Cereal and Oilseed Research Centre, Biodiversity (Mycology and Botany), Ottawa, Ontario

A new Phytophthora hybrid of Ph. cactorum (Leb. & Cohn) Schroet. and Ph. nicotianae van Breda de Haan pathogenic to cultivars of Pelargonium grandiflorum hort. is described as Phytophthora x pelgrandis and its morphological features are documented. Morphological, physiological (e.g. temperature requirements) and molecular data (DNA sequencing, random amplified polymorphic DNA-PCR) are presented for isolates of the Phytophthora hybrid. Pathogenicity was tested on cultivars of P. grandiflorum and Nicotiana tabacum. For comparison cultures of the parental species and additional Phytophthora taxa also were examined.

Key words: hybrid, ITS and Cox I sequence phylogeny, morphology, Nicotiana tabacum, pathogenicity tests, Pelargonium grandiflorum, Phytophthora cactorum, Ph. nicotianae, Ph. xpelgrandis, RAPD-PCR, taxonomy