Hero Image

Sudden Oak Death

The 2021 SOD Blitz was a success!

Blitz Results Meeting (online) Saturday 11/13 10am
We heard from Dr. Matteo Garbelotto (UC Berkeley Forest Pathology & Mycology Laboratory) about new local outbreaks and severity in previously known areas. Watch the recording to learn how to check the status of trees you sampled, treatment and diagnostic options, and plans for next year.
Watch recording of SOD Blitz Zoom event 4/30/21 here
Ver el evento grabado aquí
Kerry & Doug 20210416_185215_2
Program Coordinator Kerry Wininger & UCB Forest Pathology & Mycology Lab's Doug Schmidt urge you to check your photo guide -- only send in bay laurel and tanoak leaves!
April 30 - May 4, 2021
bilingüe en Español
Online training, virtual Q&A event (optional), mail in leaves
UC Berkeley Forest Pathology & Mycology Laboratory and UCCE Sonoma:
Test your trees for free & help scientists!
¡Prueba tus árboles de forma gratuita y ayuda a los científicos! 
Monitor disease spread, be on the lookout for new dangerous strains, and send in California bay laurel or tanoak leaves for testing. Visit the registration link for details on how the blitz will function:
  • COVID-19 safety
  • online training
  • receiving sampling packets (picked up May 1st or mailed to you)
  • optional Zoom event on April 30th from 6-7pm
  • turning them in for testing (postmark by May 4th)

Help control this destructive forest pathogen! Now in its 14th year, this statewide citizen science project is vital to managing Sudden Oak Death, which is widespread in Sonoma county. Join us to contribute to science while getting your own bay laurel or tanoak trees tested at no cost. This is a bilingual event (English and Spanish). 

¡Ayuda a controlar este destructivo patógeno del bosque! Ahora en su decimocuarto año, este proyecto de ciencia comunitaria en todo el estado es vital para administrar Sudden Oak Death, que está muy extendido en el condado de Sonoma. Únase a nosotros para contribuir a la ciencia y obtener sus propios árboles de laurel o tanoak sin costo alguno Este es un evento bilingue (Inglés y Español). 

For information about the Zoom event with Sonoma State University's Center for Environmental Inquiry visit: cei.sonoma.edu/SODblitz2021 Hosted by the UC Master Gardener Program of Sonoma County Sudden Oak Death Specialists. Thanks to the USDA Forest Service for program funding.

Learn more about SOD at www.sodblitz.org. This event is free of charge
Obtenga más información sobre SOD en www.sodblitz.orgLa registración es gratis.

Questions/Preguntas? kwininger@ucanr.edu

Virtual Oak Health Workshop recordings available

In April 2020, we hosted a series of talks on the challenges faced by California’s native oak trees and oak woodlands. Prerecorded talks were accessed online, then participants attended a live moderated Q&A session on Zoom that is now also available for viewing. Topics include:

  • Conservation of Oregon white oak and CA black oak woodlands
  • Sudden oak death and other Phytophthora problems in oaks and tanoak
  • Wildfire in tanoak, CA black oak, blue oak, & interior live oak woodlands
  • A new, non-native beetle threat to valley oaks
Read more about the event in a UCANR blog post: Hundreds sign up for online oak woodland workshop
This workshop was originally planned to take place at two field stations. Learn more about these partners below.
Sonoma State University's Fairfield Osborn Preserve:  https://www.cei.sonoma.edu
Hopland Research and Extension Center:  http://hrec.ucanr.edu

This workshop is for oak enthusiasts, landowners, natural resource managers, and foresters. For more information about the content of the workshop visit https://cei.sonoma.edu/oak-health-workshop

Learn more and access videos at:


For more information contact Kerry Wininger, UC Cooperative Extension, 707-888-5616, kwininger@ucanr.edu, or Chris Lee, Cal Fire, 707-726-1254, christopher.lee@fire.ca.gov

Thanks for making the 2019 and 2020 SOD Blitzes successful!


The last time we held a traditional SOD Blitz (pre-COVID) was in 2019. View past information about that blitz below:
Test your trees for free!
Monitor disease spread in a rainy year, be on the lookout for new dangerous strains, and test oaks for SOD with OakSTeP
Things are not "as usual." Come learn to:
  • Identify symptoms of SOD on bay laurel, oaks, and tanoak
  • Collect symptomatic leaves from bay laurel and tanoak to be analyzed at NO COST
  • Make important contributions to science
  • Visit and help your local park or preserve
New this year:
- Leaves will be tested for the new and aggressive EU1 pathogen strain. Already in Oregon
forests, we need to look for it in California to have a chance of eliminating it if found.
- Introducing the OakSTeP program that will provide an easy and affordable way for licensed arborists, tree care specialists, preserve mangers and qualified government workers to test oaks for SOD. Join the OakSTep program for FREE if you register in person during a SOD blitz ($200 value), and get priority for sample processing.
- Thinking of doing something to control SOD, or have done so already? We'll have a questionnaire and important information and tips at the trainings.
- El Fairfield Osborn Preserve blitz es un evento bilingue (Inglés y Español)
Six meetings took place this year in Petaluma, Yorkville (docent-led at SSU'sGalbreath Preserve), Sebastopol, Santa Rosa, Sonoma, and Penngrove (docent-led at SSU's Osborn Preserve) from April 25th - 27th.
The Osborn Preserve blitz in Penngrove was a bilingual event (English & Spanish) / Este es un evento bilingue (Inglés y Español) 
Unless otherwise noted, SOD blitz evens consist of a one-hour training, then you collect leaves at locations of your choice and drop them back at the meeting site that weekend. We drive leaves to UC Berkeley Lab for analysis on Monday. You get results in early fall.
There is no cost for this activity. Hosted by the UC Master Gardener Program of Sonoma County SOD Specialists and the University of California Cooperative Extension, Sonoma County. Funding provided by the USDA Forest Service. 

Video: SOD in Sonoma County