Identification of control agents and factors affecting pathogenicity of Phytophthora ramorum

Abstract

A collection of 67 isolates of Phytophthora ramorum from the United States (U.S.), European Union (EU), and Canada was screened using differences in phenotypic traits (pathogenicity, growth rate at several temperatures, and sensitivity/resistance to metalaxyl, dimethomorph, and streptomycin) and for presence of cytoplasmic elements (dsRNA and plasmids). Results of these tests showed a high level of variation among P. ramorum,/i> isolates. Isolates which differed by +/- two standard deviations from the mean are being examined for presence of dsRNA viruses and DNA plasmids. Plasmids were extracted from some of these isolates and are being characterized. To date, no dsRNA viruses have been isolated.

Parent Publication

• Proceedings of the sudden oak death third science symposium

Keywords

Phytophthora ramorum, plasmid, dsRNA virus, cytoplasmic elements, pathogenicity

Citation

Elliott, Marianne; Shamoun, Simon F.; Sumampong, Grace; James, Delano; Briere, Stephan C.; Masri, Saad; Varga, Aniko. 2008. Identification of control agents and factors affecting pathogenicity of Phytophthora ramorum. In: Frankel, Susan J.; Kliejunas, John T.; Palmieri, Katharine M., tech. coords. 2008. Proceedings of the sudden oak death third science symposium. Gen. Tech. Rep. PSW-GTR-214. Albany, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Research Station. pp. 347-350