First Report of A1 Mating Type of Phytophthora ramorum in North America

Plant Disease
Everett M HansenN K Osterbauer

Abstract

Phytophthora ramorum is known in Europe and the western United States (1). In Europe, it is found in nurseries and landscape plantings. In the United States, it has been confined to coastal forests, and in California, it is found in a few horticultural nurseries. All European isolates tested have been A1 mating type, while all North American isolates were A2 mating type (2). Amplified fragment length polymorphism markers also indicated that the populations on the two continents are distinct, and nearly all North American isolates are from one clone (Kelly Ivors, unpublished). In June 2003, P. ramorum was isolated from diseased Viburnum and Pieris spp. cultivars from a Clackamas County nursery in northern Oregon and diseased Camellia sp. cultivar from a Jackson County nursery in southern Oregon. Representative isolates were submitted to the American Type Culture Collection, Manassas, VA. As part of the effort to determine the origin of these new infestations, we tested the nursery isolates for mating type. Seven Oregon nursery isolates, three Oregon forest isolates (from the predominant North American clone), and two European isolates were paired. Agar plugs from 3-day-old colonies were placed in close proximity on carrot agar p...Continue Reading

Citations

Oct 24, 2008·Phytopathology·Jennifer M DavidsonDavid M Rizzo
Jun 1, 2010·Plant Disease·Aleksandra BulajićBranka Krstić
Oct 31, 2007·Current Genetics·Willem A Man In 't VeldHarold J G Meijer
Jan 29, 2011·Fungal Genetics and Biology : FG & B·Annelies VercauterenKurt Heungens

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