|P. ramorum: successes, failures and lessons learned that can be applied to P. tentaculata.|
R. BULLUCK (1). (1) USDA APHIS PPQ CPHST, Raleigh, NC, U.S.A.
<i>Phytophthora ramorum</i> was first discovered in nurseries more than a decade ago causing disease on ornamental plants. Since that time, the pathogen has been regulated in interstate nurseries in the western states. The USDA APHIS PPQ and our State partners have learned a great deal about <i>P. ramorum</i> and its behavior in nurseries. For the past 6 years, research on <i>P. ramorum</i> has been conducted at the National Ornamental Research Site at Dominican University of California (NORS-DUC). The information on disease development, potential locations of primary inoculum and pathogen mitigation that has been developed over the past decade in regulated nurseries and in NORS-DUC have been invaluable. This information could be useful to apply to other nurseries with oomycetes, such as <i>Phytophthora tentaculata</i>. We will explore the potential application of the <i>P. ramorum</i> information to <i>P. tentaculata</i> and other exotic oomycetes in nursery systems.