CNPS Phytophthora Resources
CNPS Ad Hoc Committee on Phytophthoras [07/22/2017 1:23pm]


On December 5, 2015, the California Native Plant Society adopted a policy on preventing infection and spread of harmful pathogens via native plant nurseries, chapter plant sales, and other growers.  The intent is to foster the use of clean native plant stock in all landscape and restoration plantings. The policy calls on CNPS to educate chapters and the public about the plant pathogen problem.

The following resources are primarily intended as guidance to CNPS Chapters that hold chapter plant sales, and to inform CNPS staff and members in their collaborative efforts with others.  Any comments on these resources are welcomed and can be sent to Steven Goetz, facilitator for the Committee, at sgoet@sbcglobal.net

Support to CNPS Chapters on BMPs:  The Ad Hoc Committee offers site visits or consultations by Committee experts to CNPS Chapters at their request.


Guidelines to Minimize Phytophthora Pathogens in Restoration Nurseries:
The goal of these guidelines is to help you design and maintain a nursery system that excludes Phytophthora and other pathogens and corrects problems if they are found. Phytophthora plant pathogens can have devastating impacts on wildlands. Once these pathogens are introduced into the wild, they are extremely difficult – if not impossible – to eradicate. Our best defense against Phytophthora species becoming established in wildlands is to prevent their inadvertent introduction via infested nursery plants. 
VIEW | DOWNLOAD 


educational materials below created for CNPS by Phytosphere Research

  • Start Here - Frequently Asked Questions about controlling the spread of Phytophthora species in native plant nursery stock.  02 December 20 2016 - These FAQs are meant as a preface to this body of work on Phytophthora.  VIEW 
  • Overview - Phytophthora Species in Native Plant Nursery Stock: Issues and Implications  10 April 2016 - This introductory document presents the problem of Phytophthora species, how plant nurseries can be a source of the pathogen, difficulty with detection, wildland infection and spread, and a systems approach to clean plant production.  VIEW  | DOWNLOAD

  • CNPS Best Management Practices (BMPs) for Producing Clean Nursery Stock.  9 April 2016- This document contains best management practices (BMPs) recommended for CNPS Chapters that hold Chapter plant sales.  CNPS supports the use of these BMPs by nurseries that provide plants for Chapter plant sales to minimize these threats.  VIEWDOWNLOAD

    • Phytosanitary Procedures for CNPS BMPs for Producing Clean Nursery Stock
      5 April 2016 -
      This document provide descriptions and details of phytosanitary procedures referenced in the CNPS BEST MANAGEMENT PRACTICES (BMPs) FOR PRODUCING CLEAN NURSERY STOCK. Note that alternative methods may be acceptable if they are supported by published data or other valid test results showing that the methods are effective. VIEW
      DOWNLOAD
    • Phytophthora Testing Procedures for CNPS BMPs for Producing Clean Nursery Stock.  7 April 2016- This document provide descriptions and details of Phytophthora testing procedures referenced in the CNPS BEST MANAGEMENT PRACTICES (BMPS) FOR PRODUCING CLEAN NURSERY STOCK. Note that some of the methods are still being tested to determine limits of sensitivity, and additional tests are under development. Very few of the methods in use have been compared side by side for sensitivity to a range of Phytophthora species.  VIEWDOWNLOAD

      Testing Resources: California Department of Food and Agriculture,
      Plant Pest Diagnostics Branch -
      3294 Meadowview Rd, Sacramento, CA 95832-1448.
      Cheryl Bloomquist, Sr. Plant Pathologist, Cheryl.bloomquist@cdfa.ca.gov 916-262-1100
      Kathy Kosta, Plant Pathologist, Kathy.kosta@cdfa.ca.gov 916-798-8385.
  • Evaluating Buy-in Material for Phytophthora.  21 February 2016- This document presents the concept that clean plant stock, free of Phytophthora, is one of the foundations of a clean nursery production system. Phytophthora species can easily be introduced into your nursery if you mix infected nursery stock from other sources (buy-in material) into your clean production area.  Discusses methods to evaluate plant stock obtained from other sources.  VIEWDOWNLOAD
  • Plant Nursery Conditions Favor Phytophthora Root Rots.  21 February 2016- To understand why Phytophthora species are so common in nurseries, we need to understand how plant diseases develop and spread, the disease cycle of Phytophthora root rots, and how nursery conditions relate to these.  This document discusses the plant disease triangle and presents the Phytophthora life cycle. VIEWDOWNLOAD
  • How Using Fungicides in Nurseries Can Increase the Risk of Moving Phytophthora to Planting Sites.  21 February 2016-  This document discusses the problems with fungicide use in the nursery, which suppress disease symptoms but do not eliminate the pathogen.  Fungicide use can also interfere with Phytophthora detection tests, resulting in false negatives.  Once container stock is no longer treated with fungicides (such as after out planting), the pathogens can spread to other stock and into the environment.
    VIEWDOWNLOAD
  • Selected literature related to Phytophthora in nurseries and restoration plantings.  February 2016- an excellent resource for related literature and background materials.  VIEW | DOWNLOAD
  • Resources from the Working Group on Phytophthora in Native Habitats.  The Ad Hoc Committee partners with the Working Group on addressing Phytophthora risks to restoration sites and wildlands. The Working Group was formed in March 2015, with the assistance of the U.C. Cooperative Extension Program, as a voluntary coalition of native plant nursery managers, land management agencies, researchers, and non-profit organizations.  Their primary purpose is to coordinate a comprehensive, unified program of management, monitoring, research, education and policy to minimize the spread of Phytophthora pathogens in restoration sites and native plant nurseries.  The Working Group sponsors seminars and workshops for outreach.  Resources developed by the Working Group can be found on their website calphytos.org


Ċ
Larry Levine,
Apr 10, 2016, 6:25 PM
Ċ
Larry Levine,
Apr 12, 2016, 1:07 AM
Ċ
Larry Levine,
Mar 3, 2016, 5:55 PM
Ċ
Larry Levine,
Apr 10, 2016, 6:25 PM
Ċ
Larry Levine,
Mar 3, 2016, 5:57 PM
Ċ
Larry Levine,
Mar 3, 2016, 5:57 PM
Ċ
Larry Levine,
Apr 12, 2016, 1:22 AM
Ċ
Larry Levine,
Mar 3, 2016, 5:56 PM
Ċ
Steven Goetz,
Dec 2, 2016, 10:53 AM
Ċ
Larry Levine,
Sep 28, 2016, 12:45 PM