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Washington State University
WSU Puyallup Ornamental Plant Pathology

Information for Nursery Professionals


Phytophthora management

Phytophthora can cause substantial problems for nurseries because they are challenging to manage and some species are heavily regulated. Therefore, the aim of this webpage is to provide information and resources to help you keep Phytophthora ramorum and other diseases out of your nursery.

Here you will find information about Best Management Practices and resources produced specifically for managing plant pathogens in nurseries. Note that many of these practices can be applied to control or prevent the establishment of a variety of plant pathogens.



Training modules


General information for nursery production

Critical Control Point Assessments

Production Visits

Contact us for a Critical Control Point Assessment. We can visit your production and provide recommendations for best management practices suited to your nursery or garden.


Management of P. ramorum in nurseries

There are four Critical Control Points to prevent the entry of waterborne diseases such as Phytophthora and Pythium into your production:

By preventing or managing diseases at these points, you can minimize the damage and loss of product, and grow clean, healthy plants.

Potted plants

Best Management Practices

The below 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.

We have provided the poster in English and Spanish versions. You can download the pdf for printing or contact Marianne Elliott to obtain the print version (24″ x 16.5″).

Additional Guides

California Urban Hort Guide for Nurseries
Defra SOD Guidelines for Nurseries
UC Davis SOD Management in Nurseries
Phytophthora ramorum guide for Oregon Nurseries Cover


Sample Collection

Visit our Regulations webpage for summaries of the  State and Federal regulations concerning P. ramorum.

California DFA Plant Quarantine Manual Cover

Feel free to contact us if you have any other questions or concerns.