Skip to Main Content
U.S. Forest Service
Caring for the land and serving people

United States Department of Agriculture

Home > Search > Publication Information

  1. Share via EmailShare on FacebookShare on LinkedInShare on Twitter
    Dislike this pubLike this pub
    Author(s): T.M. Barrett
    Date: 2006
    Source: In: Frankel, Susan J.; Shea, Patrick J.; and Haverty, Michael I., tech. coords. Proceedings of the sudden oak death second science symposium: the state of our knowledge. Gen. Tech. Rep. PSW-GTR-196. Albany, CA: Pacific Southwest Research Station, Forest Service, U.S. Department of Agriculture: 371-378
    Publication Series: General Technical Report (GTR)
    Station: Pacific Southwest Research Station
    PDF: View PDF  (93 KB)

    Description

    Understanding the impacts of Phytophthora ramorum on forests will require knowledge of pre-disease distribution, abundance, and rates of change for affected species. This study estimated pre-epidemic mortality rates for nine common host tree species: bigleaf maple (Acer macrophyllum), California bay laurel (Umbellularia californica), California black oak (Quercus kelloggii), canyon live oak (Quercus chrysolepis), coast live oak (Quercus agrifolia), Douglas-fir (Pseudotsuga menziesii), madrone (Arbutus menziesii), coastal redwood (Sequoia sempervirens), and tanoak (Lithocarpus densiflorus) using inventory data from 1981 to 1984 and 1991 to 1994 statewide inventories of private (and some public) forest land. Mortality rates that were developed represent the average annual mortality for trees that were at least 12.5 cm in diameter at 1.4 m above the ground (dbh) at the time of the first (1981-1984) inventory. Natural mortality for all trees was estimated at 0.5 percent of trees per year, with rates for individual host species ranging from 0.1 to 0.6 percent. Overall, growth exceeded natural mortality and harvest for most host species between 1981 to 1984 and 1991 to 1994. Tanoak, the most numerous tree species in the quarantined counties, increased in volume and number of trees by more than 15 percent over the decade.

    Publication Notes

    • You may send email to psw_communications@fs.fed.us to request a hard copy of this publication.
    • (Please specify exactly which publication you are requesting and your mailing address.)
    • 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.

    Citation

    Barrett, T.M. 2006. Pre-epidemic mortality rates for common Phytophthora ramorum host tree species in California. In: Frankel, Susan J.; Shea, Patrick J.; and Haverty, Michael I., tech. coords. Proceedings of the sudden oak death second science symposium: the state of our knowledge. Gen. Tech. Rep. PSW-GTR-196. Albany, CA: Pacific Southwest Research Station, Forest Service, U.S. Department of Agriculture: 371-378

    Keywords

    forest change, forest health, forest monitoring, oak decline, sudden oak death

    Related Search


    XML: View XML
Show More
Show Fewer
Jump to Top of Page
https://www.fs.usda.gov/treesearch/pubs/26646