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 (2.0 MB)

Title: Nine year survival of 16 Phytophthora lateralis resistant and susceptible Port-Orford-Cedar families in a Southern Oregon field trial

Author: Sniezko, Richard A.; Hamlin, Jim; Hansen, Everett M.; Lucas, Sunny;

Date: 2012

Source: In: Sniezko, Richard A.; Yanchuk, Alvin D.; Kliejunas, John T.; Palmieri, Katharine M.; Alexander, Janice M.; Frankel, Susan J., tech. coords. Proceedings of the fourth international workshop on the genetics of host-parasite interactions in forestry: Disease and insect resistance in forest trees. Gen. Tech. Rep. PSW-GTR-240. Albany, CA: Pacific Southwest Research Station, Forest Service, U.S. Department of Agriculture. pp. 348-355

Publication Series: General Technical Report (GTR)

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

Description: Port-Orford-cedar (Chamaecyparis lawsoniana) has suffered high mortality from the pathogen Phytophthora lateralis in portions of its natural range in southwest Oregon and northwest California, as well as in horticultural plantings in North America, and more recently in Europe. A program to develop genetically resistant populations of Port-Orford-cedar is underway. This operational program began in 1996 and utilizes artificial inoculation of the roots of young seedlings (or rooted cuttings) to rate parent trees for resistance. A key step to any such program is to establish field trials: to validate the results of artificial inoculation trials; to examine resistance at a range of sites and environments conducive to the pathogen; and to monitor the durability of resistance. The field trial ('Foggy Eden' site) examined here consists of 16 Port-Orford-cedar families established in southern Oregon in 2002 at a site on the Rogue River-Siskiyou National Forest. The Foggy Eden (FE-02) site was chosen because of the notable recent heavy P. lateralis related mortality of the natural Port-Orford-cedar trees in the immediate vicinity. Sixteen families had been selected to cover a range from highly susceptible (100 percent mortality) to highly resistant (0 percent mortality) in a previous short-term greenhouse artificial inoculation ('root dip,' RD) trial. Some of the families were also included in two short-term raised bed (RB) trials, where the raised bed had been previously infested with P. lateralis. By summer 2010, overall mortality at FE was 42.7 percent (263 of 616 trees). Most of the mortality occurred by 2006 (244 trees). Family variation in survival ranges from 20.8 to 93.8 percent. The top three families for survival involve a common parent and all have less than 11 percent mortality. The comparison of the results from FE-02 with the short-term 'root dip' and raised bed tests showed a strong relationship between these trials. The results are encouraging at this point, but the trial needs to be followed longer, and the results from the additional trials in other environments conducive to P. lateralis need to be examined to determine the efficacy of resistance in different environments. Resistant seed from wind-pollinated orchards is now available to aid restoration and reforestation.

Keywords: Port-Orford-cedar, Chamaecyparis lawsoniana, Phytophthora lateralis, genetic resistance, field trials

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:


Sniezko, Richard A.; Hamlin, Jim; Hansen, Everett M.; Lucas, Sunny. 2012. Nine year survival of 16 Phytophthora lateralis resistant and susceptible Port-Orford-Cedar families in a Southern Oregon field trial. In: Sniezko, Richard A.; Yanchuk, Alvin D.; Kliejunas, John T.; Palmieri, Katharine M.; Alexander, Janice M.; Frankel, Susan J., tech. coords. Proceedings of the fourth international workshop on the genetics of host-parasite interactions in forestry: Disease and insect resistance in forest trees. Gen. Tech. Rep. PSW-GTR-240. Albany, CA: Pacific Southwest Research Station, Forest Service, U.S. Department of Agriculture. pp. 348-355.

 


 [ 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.