Skip to page content
USDA Forest Service
  
Treesearch

Research & Development Treesearch

 
Treesearch Home
About Treesearch
Contact Us
Research & Development
Forest Products Lab
International Institute of Tropical Forestry
Northern
Pacific Northwest
Pacific Southwest
Rocky Mountain
Southern Research Station
Help
 

Science.gov - We Participate


USA.gov  Government Made Easy


Global Forest Information Service

US Forest Service
P.O. Box 96090
Washington, D.C.
20090-6090

(202) 205-8333

You are here: Home / Search / Publication Information
Bookmark and Share

Publication Information

View PDF (155.0 KB bytes)

Title: 31 flavors to 50 shades of grey: battling Phytophthoras in native habitats managed by the Santa Clara Valley Water District

Author: Hillman, Janet; Swiecki, Tedmund J.; Bernhardt, Elizabeth A.; Mehl, Heather K.; Bourret, Tyler B.; Rizzo, David;

Date: 2017

Source: Proceedings of the sudden oak death sixth science symposium. Gen. Tech. Rep. GTR-PSW-255. Albany, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Research Station: 57-58.

Publication Series: General Technical Report (GTR)

   Note: This article is part of a larger document. View the larger document

Description: The Santa Clara Valley Water District (District) is a wholesale water supplier for 1.8 million people in Santa Clara County, California. Capital, water utility, and stream maintenance projects result in extensive, long-term mitigation requirements in riparian, wetland, and upland habitats throughout the county. In 2014, several restoration sites on the valley floor and in the upper watershed were found to be contaminated by Phytophthora spp. Subsequently, an extensive baseline study of restoration sites planted in the last 3 years revealed 31 different species of Phytophthora in 16 sites, while a related study revealed at least 17 species at 13 sites, for a total of approximately 39 species across all sampled locations. Detections of P. tentaculata and P. quercina, which are ranked in the top five high-risk species to the United States by the USDA, are of particular concern. The District’s response to this high level of contamination has included development of a comprehensive set of BMPs and contract specifications for work in sensitive and contaminated areas; a short term moratorium on planting nursery container stock; a complete reevaluation of restoration practices from seed collection, growing of stock to planting out; participation in regional working groups on the emerging pathogen threat; education of stakeholders, project planners, regulatory personnel, district staff and contractors; and additional testing and site remediation where feasible. Remediation of infected sites has proved challenging due to cost, site access, and dense urbanization in the lower watershed.

Publication Notes:

  • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
  • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

XML: View XML

Citation:


Hillman, Janet; Swiecki, Tedmund J.; Bernhardt, Elizabeth A.; Mehl,Heather K.; Bourret, Tyler B.; Rizzo, David 2017. 31 flavors to 50 shades of grey: battling Phytophthoras in native habitats managed by the Santa Clara Valley Water District. In: Frankel, Susan J.; Harrell, Katharine M., tech. coords. Proceedings of the sudden oak death sixth science symposium. Gen. Tech. Rep. GTR-PSW-255. Albany, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Research Station: 57-58.

 


 [ Get Acrobat ]  Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility

USDA logo which links to the department's national site. Forest Service logo which links to the agency's national site.