Canadian Forest Service Publications

An Evaluation of Phytophthora ramorum Preventative Treatments for Nursery and Forest Understory Plants in British Columbia, Canada. 2010. Becker, E.M.; Sumampong, G.; Shamoun, S.F.; Elliott, M.; Varga, A.; Masri, S.; James, D.; Bailey, K.; Boyetchko, S. Pages 288-291 in S.J. Frankel, J.T. Kliejunas, and K.M. Palmieri, technical coordinators. Proceedings of the Sudden Oak Death Fourth Science Symposium. Gen. Tech. Rep. PSW-GTR-229, June 15-18, 2009, Santa Cruz, California. Department of Agriculture, Forest Service, Pacific Southwest Research Station, Albany, CA, U.S.

Year: 2010

Issued by: Pacific Forestry Centre

Catalog ID: 31701

Language: English

Availability: PDF (download)

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Foliar treatments were applied to potted Rhododendron sp. cv 'Cunningham's white' plants over a 3-week period and evaluated for their ability to protect the leaves from Phytophthora ramorum infection. Treatments included several chemical and biological control products and systemic acquired resistance (SAR) elicitors. Excised leaves from treated plants were challenged by application of P. ramorum sporangia. Our preliminary results indicated that the most effective treatments were the two products registered for prevention of P. ramorum in Canada, Aliette® and Subdue Maxx®. Biocontrol treatments Rhapsody® and Actinovate® and SAR elicitors 3-aminobutyric acid (BABA) and Actigard® conferred a lesser degree of protection to the leaves and lowered the incidence of P. ramorum infection. Treatment with Sonata® was not significantly different than that with water. The chemical BABA did not inhibit P. ramorum growth in vitro. Plant trials are ongoing.