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The Occurrence of Phytophthora ramorum in Nursery Stock in California, Oregon, and Washington States

K. M. Tubajika, R. Bulluck, P. J. Shiel, S. E. Scott, A. J. Sawyer

March 2006


Data from nursery surveys conducted in 2003, 2004, and 2005 for ramorum blight and dieback caused by Phytophthora ramorum were analyzed to determine which plant cultivars were likely to be infected with P. ramorum. Susceptible plant host genera, species, and cultivars were identified using culture and nested-polymerase chain reaction analyses, and disease incidence was calculated. This study indicated that there is a large variation in disease incidence among genera and specific cultivars within a genus.


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