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Research Project: Integrated Disease Management of Exotic and Emerging Plant Diseases of Horticultural Crops

Location: Horticultural Crops Research

Title: Sudden Oak Death in Oregon forests: Recent disease intensification and spread, and changes to the management program

item Kanaskie, Alan - Oregon Department Of Forestry
item Goheen, Ellen - Us Forest Service (FS)
item Hansen, Everett - Oregon State University
item Reeser, Paul - Oregon State University
item Sutton, Wendy - Oregon State University
item Grunwald, Niklaus - Nik
item Rhatigan, Ron - Oregon Department Of Forestry
item Wiese, Randall - Oregon Department Of Forestry
item Laine, Jon - Oregon Department Of Forestry

Submitted to: Meeting Proceedings
Publication Type: Proceedings
Publication Acceptance Date: 11/5/2014
Publication Date: 1/1/2015
Citation: Kanaskie, A., Goheen, E.M., Hansen, E., Reeser, P., Sutton, W., Grunwald, N.J., Rhatigan, R., Wiese, R., Laine, J. 2015. Sudden Oak Death in Oregon forests: Recent disease intensification and spread, and changes to the management program. In: Proceedings of the 7th meeting of the International Union of Forest Research Organization (IUFRO) Working Party S07.02.09: Phytophthoras in forests and natural ecosystems; 11/9/14-11/14/14; Esquel, Argentina. Available: 81p.

Interpretive Summary:

Technical Abstract: Sudden Oak Death, caused by Phytophthora ramorum, is lethal to tanoak (Notholithocarpus densiflorus) and threatens the species throughout its range in Oregon. Since July 2001, an interagency team has been attempting to eradicate and slow spread of disease through a program of early detection and destruction of infected and nearby host plants. Because of increasing disease, high eradication costs and limited funding, all infested sites cannot be treated equally. Highest priority for treatment are sites located at or beyond the leading edge of the infestation or near the quarantine boundary. Within a 145 km2 Generally Infested Area near the center of the quarantine area most sites have not been treated and the disease has been allowed to intensify and spread. Where eradication treatments have stopped, canopy tanoak mortality increased from nearly zero to 50 percent during the 2012-2014 period. Changes to the sudden oak death management program are discussed.