Ebba Peterson

IPM Educator

she/her

peterebb [at] science.oregonstate.edu

My experience broadly covers the epidemiology, diversity, and management of Phytophthora phytopathogens of woody plants. My research provides information needed to make management decisions aimed at preventing the spread of these invasive pathogens in a wide array of environments: wildlands, restoration plantings, production nurseries, and native plant nurseries. Much of my focus has been on the landscape dynamics and long-term impacts of Phytophthora ramorum, causal agent of sudden oak death in Southwest Oregon. I also focus on the distribution of soilborne pathogens in the coastal plant communities of central California.

After 10 years as a Research Associate in the Dept. of Botany & Plant Pathology, I recently started a new position at the Oregon IPM Center. Here I am developing outreach content in the promotion of Integrated Pest Management, with the goal of solving pest problems affecting the health and sustainability of our community.

Professional Accomplishments

Education:

Ph.D. Oregon State University, 2012 (Botany and Plant Pathology)

M.S. Oregon State University, 2009 (Botany and Plant Pathology)

B.S. University of California Santa Cruz, 2004 (Plant Biology)

My Publications

Proceedings and Conference Presentations:

Peer Review Publications

Peterson, E.K., Søndreli, K.L., Reeser, P., Navarro, S., Nichols, C., Weise, R., Fieland, V.J., Grünwald, N.J., and LeBodlus, J.M. 2022. First report of the NA2 clonal lineage of the sudden oak death pathogen, Phytophthora ramorum, infecting tanoak in Oregon forests. Plant Disease 106:2537.

Peterson, E.K., Grünwald, N.J., and Parke, J.L. 2021. Risk of epidemic development in nurseries from soil inoculum of Phytophthora ramorum. Phytopathology 112(5):1046-1054.

Peterson, E.K., Rupp, F., Eberhart, J., and Parke J.L. 2020. Root rot of Juniperus and Microbiota by Phytophthora lateralis in Oregon horticultural nurseries. Plant Disease 104:1500-1506.

Peterson, E.K., Larson, E., and Parke, J.L. 2019. Film-forming polymers and surfactants prevent infection and sporulation of Phytophthora ramorum on rhododendron. Plant Disease 103:1148-1155.

Shaw. D., Wooley, T., Kelsey, R., McPherson, B., Westlind, D., Wood, D., and Peterson, E. 2017. Surface fuels in recent Phytophthora ramorum created gaps and adjacent intact Quercus agrifolia forests, East Bay Region, California. Forest Ecology and Management 384:331-338.

Peterson, E.K., Hansen, E., Kanaskie, A. 2015. Temporal epidemiology of sudden oak death in Oregon. Phytopathology 105:937-946.

Peterson, E.K., Hansen E., Kanaskie, A. 2014. Spatial relationship between Phytophthora ramorum and roads or streams in Oregon tanoak forests. Forest Ecology and Management 312:216-224.

Peterson, E.K., Hansen, E., Hulbert, J. 2014. Source or sink? The role of soils and waterways in the dispersal of Phytophthora ramorum in Oregon forests. Forest Ecology and Management. 322:48-57.

Other Publications

Parke, J. L., and Peterson, E.K. 2019. Sudden oak death, sudden larch death, and ramorum blight. The Plant Health Instructor. DOI: 10.1094/PHI-I-2008-0227-01

Peterson, E.K. 2014. The war on sudden oak death in southwest Oregon continues, but nursery diligence still makes a difference. Digger 58(3): 33-37

Peterson, E.K. 2009. 2009 Pacific Northwest Plant Disease Management Handbook. Oregon State University. Pscheidt, J.W. and Ocamb, C.M., eds. p. 448.

Peterson, E.K. 2008. The Natural History of the UC Santa Cruz Campus, 2nd ed. Environmental Studies Department, UC Santa Cruz, CA. Haff, T.M., Brown, M.T., and Tyler, W.B., eds. pp. 119 & 140-141.

Presentations

Peterson, E.K. Eberhart, J., Redekar, N., Mills, A., and Parke, J.L. 2021. Results of Midpeninsula Regional Open Space District Phytophthora study. California Oak Mortality Task Force, September 21-23, 2021.

Peterson, E.K. Eberhart, J., Redekar, N., Mills, A., and Parke, J.L. 2019. Metabarcoding of Phytophthora communities at restoration sites in San Francisco peninsula open spaces. Ninth Meeting of the International Union of Forest Research Organizations (IUFRO) Working Party “Phytophthora in Forests and Natural Ecosystems”, October 21-25, 2019, La Maddalena, Sardinia, Italy.

Peterson, E.K., Eberhart, J., Redekar, N., Mills, A., and Parke, J.L. 2019. Soilborne Phytophthora spp. at restoration sites in the Midpeninsula Regional Open Space District. The 7^th Sudden Oak Death Science and Management Symposium, 25-27 June 2019, San Francisco, California.

LeBoldus, J.M., Sondreli, K.L., and Peterson, E.K. 2019. Comparative epidemiology of EU1 and NA1 lineages of Phytophthora ramorum in Southwestern Oregon tanoak forests. The 7^th Sudden Oak Death Science and Management Symposium, 25-27 June 2019, San Francisco, California.

Peterson, E., Mills, A., Roessler, C., and Parke, J. 2018. Assessment of soilborne Phytophthora pathogens at restoration sites in the Midpeninsula Regional Open Space District. California Invasive Plant Council Symposium, 7-10 November 2018, Monterey, Oregon.

Peterson, E.K., Parke, J.L., and Grünwald, N.J. 2018. Epidemiology of soilborne inoculum of Phytophthora ramorum in nurseries. Joint meeting of the APS Pacific Division (APS) and Conference on Soilborne Plant Pathogens (CSPP), 25-27 June 2018, Portland, Oregon.

Peterson, E.K., Parke, J.L., and Grünwald, N.J. 2016. Incubation of Phytophthora ramorum-infested leaf debris in soil affects survival, sporulation capacity, and subsequent risk of epidemic development within nurseries. The 6^th Sudden Oak Death Science Symposium: Biosecurity, Plant Trade, and Native Habitats, 21-23 June 2016, San Francisco, California.

Peterson, E.K., and Parke, J. 2016. Control of foliar infection of rhododendron by Phytophthora ramorum using film-forming polymers and surfactants. 90^th Western Disease Conference, 13-15 January 2016, Portland, Oregon.

Peterson, E.K., Hansen, E.M., Kanaskie, A. 2015. Temporal epidemiology of sudden oak death in Oregon: prioritizing our detection methods to manage EU1 in Curry County. 63^rd Western International Forest Disease Work Conference (WIDFWC) conference, 21-25 September 2015, Newport, Oregon.

Peterson, E.K., Parke, J., and Grünwald, N.J. 2015. Incubation in soil reduces sporulation and risk of epidemic development from leaf disks infested by Phytophthora ramorum. American Phytopathological Society (APS) Annual Meeting, 1-5 August 2015, Pasadena, California.

Peterson, E. 2014. Assessing the risk of soil and waterborne inoculum for the long distance dispersal of Phytophthora ramorum in Oregon tanoak forests. 60^th Conference on Soilborne Plant Pathogen, 11-13 March 2014, San Rafael, California.

Peterson, E.K. 2012. The importance of understory infection by P. ramorum as a means of primary disease establishment in Oregon forests. Sudden Oak Death Fifth Science Symposium, 19-22 June 2012, Petaluma, California.

Peterson, E. 2011. Update on the epidemiology of sudden oak death in Oregon forests. 59^th Western International Forest Disease Work Conference (WIDFWC) conference, 10-14 October 2011, Leavenworth, Washington.

Hall, K., Albers, H.J., Collins, B., Guillozet, K., Haim, D., Martin, D., Norlander, D., Peterson, E., Shaw, D., and Thompson, M. 2008. Ecological and economic impacts of sudden oak death in Oregon with an emphasis on barrier zones and quarantines. 93^rd Ecological Society of America Annual Meeting, 3-8 August, 2008, Milwaukee, Wisconsin.

Hadj-Chikh, L., Frangioso, K., Fischer, K., Bergemann, S., and Peterson, E. 2005. Patterns of tanoak acorn production in infested and uninfested stands in Big Sur, CA, with insights from girdled tanoaks. Sudden Oak Death Second Science Symposium, 18-21 Jan. 2005, Monterey, California.

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Ebba Peterson

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