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Assessing the Effect of Vernalization on the Detection of Phytophthora ramorum from Native Soil, Potting Media, and Cull Piles in Oregon Nurseries

N. K. Osterbauer, S. Navarro, S. Lane, and A. Trippe

January 2015


Nurseries in which Phytophthora ramorum is detected must undergo the USDA Confirmed Nursery Protocol (CNP) to eliminate the pathogen. The CNP requires a survey to determine the extent of the nursery’s infestation, with samples tested immediately and after a required vernalization period. Previous research suggested this improves detection. Our objective was to determine if vernalization influenced pathogen recovery from native soil, potting media, and cull piles naturally exposed to P. ramorum in infested Oregon nurseries.


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