Journal
PHYTOPATHOLOGY
Volume 105, Issue 7, Pages 982-989Publisher
AMER PHYTOPATHOLOGICAL SOC
DOI: 10.1094/PHYTO-12-14-0350-FI
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Funding
- United States Department of Agriculture (USDA) Agricultural Research Service (ARS) [5358-22000-039-00D]
- USDA Animal and Plant Health Inspection Service
- USDA-ARS Floriculture Nursery Initiative
- Oregon Department of Agriculture/Oregon Association of Nurseries (ODA-OAN)
- USDA Forest Service Forest Health Monitoring Program
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Sudden oak death caused by the oomycete Phytophthora ramorum was first discovered in California toward the end of the 20th century and subsequently emerged on tanoak forests in Oregon before its first detection in 2001 by aerial surveys. The Oregon Department of Forestry has since monitored the epidemic and sampled symptomatic tanoak trees from 2001 to the present. Populations sampled over this period were genotyped using microsatellites and studied to infer the population genetic history. To date, only the NA1 clonal lineage is established in this region, although three lineages exist on the North American west coast. The original introduction into the Joe Hall area eventually spread to several regions: mostly north but also east and southwest. A new introduction into Hunter Creek appears to correspond to a second introduction not clustering with the early introduction. Our data are best explained by both introductions originating from nursery populations in California or Oregon and resulting from two distinct introduction events. Continued vigilance and eradication of nursery populations of P. ramorum are important to avoid further emergence and potential introduction of other clonal lineages.
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