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Diversity of Foliar Phytophthora Species on Rhododendron in Oregon Nurseries

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https://ir.library.oregonstate.edu/concern/articles/3x816p178

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  • The genus Phytophthora contains some of the most notorious plant pathogens affecting nursery crops. Given the recent emergence of the sudden oak death pathogen Phytophthora ramorum, particularly in association with Rhododendron spp., characterization of Phytophthora communities associated with this host in nursery environments is prudent. Many taxa may present symptoms similar to P. ramorum but we do not necessarily know their identity, frequency, and importance. Here, we present a survey of Phytophthora taxa observed from seven nurseries in the U.S. state of Oregon. Incidence and diversity of Phytophthora communities differed significantly among nurseries and among seasons within nursery. The taxa P. syringae and P. plurivora were widespread and detected at most of the nurseries sampled. Nine other taxa were also detected but were found either in a single nursery or were shared among only a few nurseries. Characterization of the Phytophthora communities present in nurseries is an important step toward understanding the ecology of these organisms as well as an aid to nursery managers in determining what risks may be present when symptomatic plants are observed. This study builds on an increasing literature, which characterizes Phytophthora community structure in nurseries.
  • This is the publisher’s final pdf. The published article is copyrighted by American Phytopathological Society and can be found at: http://apsjournals.apsnet.org/loi/pdis
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  • Knaus, B. J., Fieland, V. J., Graham, K. A., & Grünwald, N. J. (2015). Diversity of Foliar Phytophthora Species on Rhododendron in Oregon Nurseries. Plant Disease, 99(10), 1326-1332. doi:10.1094/PDIS-09-14-0964-RE
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  • 99
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  • 10
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  • A supplement with restriction size data and GenBank accessions is deposited at figshare (24):
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  • This project was supported by funds from USDA-ARS CRIS Project 5358-22000-039-00D, the USDA-ARS Floriculture Nursery Initiative, the USDA ARS NW Center for Nursery Crops, and the Oregon Department of Agriculture/Oregon Association of Nurseries (ODA-OAN) research programs.
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