Skip to page content
USDA Forest Service

Research & Development Treesearch

Treesearch Home
About Treesearch
Contact Us
Research & Development
Forest Products Lab
International Institute of Tropical Forestry
Pacific Northwest
Pacific Southwest
Rocky Mountain
Southern Research Station
Help - We Participate  Government Made Easy

Global Forest Information Service

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

(202) 205-8333

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

Publication Information

View PDF (433 KB bytes)

Title: Genetic variation in tolerance of Douglas-fir to Swiss needle cast as assessed by symptom expression.

Author: Jonhson, G.R.;

Date: 2002

Source: Silvae Genetica. 51(2-3): 80-88

Publication Series: Scientific Journal (JRNL)

Description: The incidence of Swiss needle cast on Douglas-fir has increased significantly in recent years on the Oregon coast. Genetic variation in symptoms of disease infection, as measured by foliage traits, was assessed in two series of progeny trials to determine whether these "crown health" indicators were under genetic control and correlated with tolerance; tolerance being continued growth in the presence of high disease pressure. Foliage traits generally had lower heritabilities than growth traits of crown density and color appeared to be reasonable indicators of disease tolerance. In the absence of basal-area data, assessing crown density and color can help screen for families that show tolerance to the disease.

Keywords: resistance, Phaeocryptopus gaeumannii, Pseudotsuga menziesii, genetic gain

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.



Jonhson, G.R. 2002. Genetic variation in tolerance of Douglas-fir to Swiss needle cast as assessed by symptom expression. Silvae Genetica. 51(2-3): 80-88


 [ 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.