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United States Department of Agriculture

Agricultural Research Service

Research Project: EXOTIC, EMERGING, RE-EMERGING, AND INVASIVE PLANT DISEASES OF HORTICULTURAL CROPS

Location: Horticultural Crops Research

Title: Population Structure of Phytophthora ramorum in Oregon

Authors
item Prospero, S - SWISS FEDERAL INSTITUTE
item Britt, J - OREGON STATE UNIVERSITY
item Grunwald, Niklaus
item Hansen, E - OREGON STATE UNIVERSITY

Submitted to: Sudden Oak Death Science Symposium
Publication Type: Proceedings
Publication Acceptance Date: September 12, 2007
Publication Date: March 15, 2008
Citation: Prospero, S., Britt, J., Grunwald, N.J., Hansen, E.M. 2008. Population Structure of Phytophthora ramorum in Oregon. Proceedings of the Sudden Oak Death Science Symposium. p. 239-242.

Technical Abstract: Phytophthora ramorum is infecting plants in Oregon forests and nurseries. In this study, we analyzed the population structure of P. ramorum in Oregon from 2001 to 2004, using microsatellites. The P. ramorum population in Oregon is characterized by low genetic diversity, significant genetic differences between nursery and forest populations, and no evidence of sexual recombination. The forest population is dominated by a single multilocus genotype in all four years, indicating the persistence of pathogen inoculum. In nurseries, identical genotypes were not recovered during both sampling years (2003 and 2004), suggesting pathogen eradication was effective. This research highlights the continued importance of sanitation and quarantine in nursery production to prevent further introduction and spread of P. ramorum.

Last Modified: 9/10/2014
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