- A Christmas Tree Grower’s Guide to Phytophthora ramorum (COMTF Nov. 2006)
- P. ramorum Guide for Forest Managers, Christmas Tree Growers, and Forest-Tree Nursery Operators (OSU Extension April 2006)
- Photo gallery of P. ramorum symptoms on conifers (under construction)
Because they are open to the public, botanical gardens are at risk of damage from SOD and other diseases and pests. Find out how you can prevent introduction of these organisms and what to do if they get in:
Guidelines for bio-security
These documents from the UK National Trust have information that will also apply to public gardens in the US and Canada:
NT Plant Quarantine and Bio-security Guidance Notes
This poster illustrates best management practices for preventing disease and pest problems in gardens and nurseries. It can be posted in a break room or other common area to educate workers, volunteers, and others. Available in English and Spanish versions.
Or contact Marianne Elliott to obtain the print version (24″ x 16.5″)
Many thanks to Ian Wright, The National Trust, for providing the information on this webpage.
National Trust is a UK charity formed over 100 years ago to protect places of Historic Interest or Natural Beauty, for ever for everyone.
It now manages 1 million acres of countryside, 600 miles of Coastline, 240 Buildings of Historic importance and 220 historic gardens and parks (covering 35,600 acres in England, Wales and Northern Ireland. The National Trust is financially supported by membership subscriptions, donations and visitor income.
Over 3.5 million people are members of the National Trust. 12 million people visit our gardens each year. Over 700 plants have been raised, bred or named at our gardens. Our gardens span over 700 years of garden history and plant collecting.
Are you interested in keeping Phytophthora ramorum and other diseases out of your nursery?
Here are some resources to help you get started:
- Phytophthora Online Course: Training for Nursery Growers (OSU Professional and Continuing Education)
- Best Management Practices Online Tool (University of California, Agriculture and Natural Resources Nursery and Floriculture Alliance)
Management of P. ramorum in nurseries
- Managing Phytophthora diseases in the nursery – photos, links, and other information about critical control points for Phytophthora diseases.
- “How to keep P. ramorum out of your nursery” brochure (pdf)
- Oregon’s Grower Assisted Inspection Program (GAIP)
- Canadian P. ramorum Certification program
- Phytophthora ramorum Nursery Industry Best Management Practices Manual provided by the California Association of Nurseries and Garden Centers (CANGC), (September 2008)
We also offer a Critical Control Point assessment, where you will learn best management practices suited to your nursery or garden.
Regulations: State and Federal regulations concerning P. ramorum.
General information for nursery production
Raising and Selling Ornamental Nursery Stock in Washington State by Charles Brun, WSU Extension publication EM102E
Best management Practices Poster:
This poster illustrates best management practices for preventing disease and pest problems in gardens and nurseries. It can be posted in a break room or other common area to educate workers, volunteers, and others. Available in English and Spanish versions. Download the pdf for printing:
Or contact Marianne Elliott to obtain the print version (24″ x 16.5″)
Sudden Oak Death
- Global Invasive Species Database
- USDA-APHIS P. ramorum website
- California Oak Mortality Task Force (COMTF) website – Complete, up to date information about SOD mostly relating to California but including links to other areas
- P. ramorum outbreak on larch in the UK – Get the latest news on the P. ramorum situation in the UK, where the disease has spread to larch and other conifers.
Hosts and identification
- P. ramorum host list from USDA-APHIS
- Symptoms on various hosts (USDA-APHIS)
- P. ramorum IPM guides for the home gardener on HortSense:
- Sudden Oak Death (Common Diseases)
- Do I have P. ramorum? Sample submission guidelines
Some things you will find here:
- Education– nursery management, symptom identification guides, information for Master Gardeners, events
- Research – host testing, fungicide testing, population genetics, disease management
- Monitoring – stream monitoring, population genetics of P. ramorum in WA
What is Sudden Oak Death? Sudden Oak Death is the common name for a disease caused by Phytophthora ramorum, a non-native plant pathogen. P. ramorum is currently only known to occur in 14 counties in California, a small area in southwestern Oregon and several European countries. P. ramorum has killed hundreds of thousands of oak and tanoak trees in California, and has affected larch plantations in the UK. In Washington and Oregon, P. ramorum is found in mainly ornamental plant nurseries. P. ramorum has been present in Washington state since 2004, yet no forest outbreaks have occurred as they have in California, Oregon, and the UK. This may not be the case with the next invasive plant pathogen, therefore the use of Best Management Practices (BMPs) for growing clean plants is important for nurseries to adopt.
On this website we provide general BMPs for Phytophthora that can be used on a variety of crops. Other Phytophthora diseases, such as those that cause root disease, can be more damaging than P. ramorum on their hosts.
- Invasive species blog (Center for Invasive Species Prevention)
- Soil steaming and steam boiler blog (MSD AG (Möschle-Seifert-Dämpftechnik))
Are Invasive Plant Pathogens Moving into the Puyallup River Watershed?– A presentation from the Puyallup River Science Symposium 12/7/2018
Critical Control Point assessment for nurseries – find out where the problem areas are and fix them.
Let us know if you see broken links or other problems.
With funding provided by the USDA Forest Service and National Plant Diagnostic Network, WSU has developed an education program based at WSU Puyallup which develops educational material and presents workshops and research seminars relating to P. ramorum and other Phytophthora diseases throughout Washington.
WSU provides educational resources for homeowners, Master Gardeners, and nursery professionals such as symptom recognition and early detection of SOD and other Phytophthora diseases. Early detection is key in reducing the risk of widespread outbreaks and protecting Washington’s nursery, landscape, and forest industries from the potentially devastating effects of P. ramorum and other invasive plant diseases.
Best management practices (BMPs) for nurseries are another component of the WSU SOD Education Program. Proper use of BMPs will help nurseries prevent infestation by P. ramorum and other invasive plant diseases, as well as deal with an infestation once it has occurred.
Local students can also get research experience by working on various projects related to Phytophthora.
- Información en español
- General information about SOD for homeowners and the general public.
- Information for nursery professionals
- Managers, employees, and volunteers in public gardens
- Christmas tree growers and forest managers
- For those who work with native plants.
- Information for Master Gardeners
- For students
- Publications – brochures, posters, etc.
Questions or comments? Tell us what you think.
We are moving the old Washington State SOD Blog to this new location.