Sudden Oak Death

Sudden Oak Death in California: Unusually large numbers of coast live oak, tanoak, and black oak have been dying in coastal areas of California.  Foliage of affected trees may appear to die rapidly, turning from green to brown within a few weeks.  This epidemic is caused by a previously unknown species of Phythopthora.  Tree deaths are particularly severe in Marin, Santa Cruz, and Monterey counties in the Coast Ranges.  These are particularly important to find as a potential fire danger.

If you see a tree that you believe has S O D, please call the Master Gardener hotline (SLO: 781-5939; Paso Robles: 237-3100) to report it.  We need to be aware when it enters
SLO County!  Wood from such trees may NOT be transported.

S O D has been found only in Black Oak, Tan Oak, and Coast Live Oak.

Use these pictures to help identify what kind of oak you see.  Slides from the Sudden Oak Death Training Presentation by the
California Oak Mortality Force

Black Oak

Tanoak

Coast Live Oak

 

When you're out hiking or just walking in the woods, watch out for these symptoms, on these specific trees.  On the Tanoak...a wilting of the newly leafed branch tips.  On the Black Oak, and the Coast Live Oak, reddish-brown to black sticky globules of "sap", or an oozing area.

 


Oak Resources On-line

Lots of other information is available on Sudden Oak Death, as well as other oak tree issues.

·         Oak Mortality Task Force: http://www.suddenoakdeath.org/

·         University of California Integrated Hardwood Range Management Program: http://danr.ucop.edu/ihrmp

·         UCCE Marin County: http://cemarin.ucdavis.edu

·         UC Berkeley: http://nature.berkeley.edu/forestry/curr_proj/sudden.html

·         California Oak Foundation: http://www.californiaoaks.org

Additional California Native Oak Resources

Interested in learning more about our great native oaks?
  Here is a sample of some of the resources available

Living Among the Oaks: A Management Guide for Landowners.  Available from the
University of California Cooperative Extension, DANR catalog item.

The Life of an Oak by Glenn Keator, illustrated by Susan Bazell, co-published by Heyday Books & the California Oak Foundation (1998) takes an intimate look at all aspects of the genus Quercus, from an examination of cellular processes to the spread around the world of this remarkable, diversified family.  256 pg., 75 full-color photographs, 30 full-color illustrations, 21 black and white diagrams.  Paperback $17.95

Oaks of California by Bruce M. Pavlik... [et al], co-published by Cachuma Press & the California Oak Foundation (3rd printing 1995).  The first book ever devoted to the state's native oaks celebrates the unique place held by these trees in
California's natural and cultural heritage.  Beautifully illustrated.  184 pg. Hardcover $29.95; Paperback, 4th printing 2000, $22.95, 4th printing 2000.

Compatible Plants Under and Around Oaks  Published by the California Oak Foundation (revised 2000) Homeowners, developers, landscape professionals, and planners will find the plant charts and care guidelines essential.  69 pages. Paperback $12.00

Books are available from local book retailers or 

The California Oak Foundation; 1212 Broadway,
Suite 810, Oakland, CA 94612; Phone: 510-763-0282

University of California Cooperative Extension Master Gardener Volunteers can provide additional gardening information upon request .Call the San Luis Obispo office at 781-5939 on Mondays and Thursdays from 1 to 5 PM.  You may also call the Paso Robles office at 237-3100 on Wednesdays from 9 AM to 12 PM.  The San Luis Obispo Master Gardeners website is at http://groups.ucanr.org/slomg/.  Questions can be e-mailed to: mgsanluisobispo@ucdavis.edu.