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Persistence of Phytophthora ramorum after eradication treatments in Oregon tanoak forestsAuthor(s): Ellen Goheen; Everett Hansen; Alan Kanaskie; Wendy Sutton; Paul Reeser
Source: Gen. Tech. Rep. PSW-GTR-221. Albany, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Research Station: 173-176
Publication Series: General Technical Report (GTR)
Station: Pacific Southwest Research Station
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DescriptionSudden oak death, caused by Phytophthora ramorum, was identified in late July 2001 in forest stands in Curry County on the Southwest Oregon coast where it was killing tanoak (Lithocarpus densiflorus) and infecting Pacific rhododendron (Rhododendron macrophyllum) and evergreen huckleberry (Vaccinium ovatum). Affected stands occurred on industrial forest land, non-industrial forest land, and federal forest land. Treatments to eradicate the pathogen from affected sites were started in the fall of 2001 and consisted at that time of cutting, piling, and burning all infected host vegetation and any known Oregon host species within a 15 to 30 meter buffer around all infected plants. While a number of plant species on the official host or associated host lists occured in Oregon forests, only those plant species that had a history of being infected in Oregon were treated. Patch size of the initial treatment areas ranged from 0.2 to 4.5 hectares. Since that time, additional disease centers have been identified and eradication treatments have been completed at every site. Some treatments were adjacent to sites treated previously while others involved distinct new centers. Size of treated sites has varied widely. Over the last five years, treatment methods have been altered to reflect increased understanding of host susceptibility and pathogen survival and spread. Additional treatment components have included various combinations, where possible, of backpack herbicide spraying to kill stump sprouts, stump-top treatments with herbicides to prevent tanoak sprouting, injecting all tanoaks greater than 2.5 cm diameter with herbicides to prevent sprouting, raking, piling, and burning all Oregon host material, and increasing buffer width to 100 meters. Some sites have been planted with conifer seedlings while others have not.
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CitationGoheen, Ellen Michaels; Hansen, Everett; Kanaskie, Alan; Sutton, Wendy; Reeser, Paul . 2009. Persistence of Phytophthora ramorum after eradication treatments in Oregon tanoak forests. In: Goheen, E.M.; Frankel, S.J., tech. coords. Proceedings of the fourth meeting of the International Union of Forest Research Organizations (IUFRO) Working Party S07.02.09: Phytophthoras in forests and natural ecosystems. Gen. Tech. Rep. PSW-GTR-221. Albany, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Research Station: 173-176
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