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Washington State University
WSU Puyallup Ornamental Plant Pathology

Native Plants

Learn about the possible risk of P. ramorum establishment on WA native plants and some invasives commonly found in WA forests and riparian areas.

Check out these best management practices used in ornamental nurseries.

More best management practices for native plant growers.

Multi-state research project: Are plant pathogens entering nurseries from wildland forests? Are native plant nurseries serving as pathogen gateways?


Phytophthora Diseases in Native Plant Production – Why Should I Care and What Can I Do About It? Marianne Elliott, College of Agricultural, Human, and Natural Resource Sciences, Washington State University, Puyallup, WA and Jennifer Parke, Oregon State University, Dept. of Crop and Soil Science & Dept. of Botany and Plant Pathology, Corvallis, OR. Presentation at 7th Western Native Plant Conference, December 6-8 2016, Vancouver WA.

Sudden Oak Death and other Phytophthora diseases in Washington ecosystems

Sudden Oak Death is devastating California forests, but what about in Washington? For those interested in the potential effects of P. ramorum on WA forests, native plants, and implications to trade in forest products. Other Phytophthora species and their role in forest ecosystems will be discussed.
Contact Marianne Elliott ( to schedule for your group.



A new Phytophthora disease of native plants in California.  Thomas D. Landis, Forest Nursery Notes – Summer 2015.

Sudden oak death and associated diseases caused by Phytophthora ramorum. Davidson, J. M., Werres, S., Garbelotto, M., Hansen, E. M., and Rizzo, D. M. 2003. Online. Plant Health Progress: doi:10.1094/PHP-2003-0707-01-DG.


Phytophthora species in native plant nursery stock: issues and implications – By Tedmund J. Swiecki and Elizabeth A. Bernhardt, Phytosphere Research, February 2017

Plant Associations in Washington’s Puget Trough Ecoregion WA Department of Natural Resources

A Phytophthora tentaculata Pest Alert is now available.

More about P. tentaculata in California:
Phytophthora tentaculata: History, Host Range, and Status in California Nurseries   (video)

Contact: Gary Chastagner, 253-445-4528 | WSU Puyallup Research & Extension Center, 2606 West Pioneer, Puyallup, WA, 98371-4998 USA
Last updated January 2, 2013