Sudden Oak Death

Join a 2019 SOD Blitz -- next weekend!


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)
Register online for  one of these six meetings:
Thursday, April 25 at 5:30 pm
1) Petaluma Community Center
320 N. McDowell Blvd, Petaluma
Saturday, April 27 from 9:00 am - 1:00pm 
2) Galbreath Preserve *docent-led sampling event at the preserve
Meet at the Yorkville Post Office, 25400 CA-128, Yorkville
In partnership with Sonoma State University's Center for Environmental Inquiry; See registration page for restrictions
Saturday, April 27 at 9:30 am (THREE LOCATIONS)
3) O'Reilly Media community room
1005 Gravenstein Hwy N., Sebastopol

4) Spring Lake Park, Environmental Discovery Center
393 Violetti Road, Santa Rosa 

5) Sonoma Valley Regional Park  
13630 Sonoma Hwy, Glen Ellen 

Sunday, April 28 from 9:00am - 12:00pm
6) Fairfield Osborn Preserve *docent-led sampling event at the preserve
Fairfield Osborn Preserve, Lichau Rd, Penngrove 94951
In partnership with Sonoma State University's Center for Environmental Inquiry; See registration page for restrictions
*This is a bilingual event (English & Spanish) / Este es un evento bilingue (Inglés y Español) 
Unless otherwise noted, you will attend a one-hour training, then 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. 
KRCB News Story -- Gathering Leaves: Sudden Oak Death Research

In collaboration with the University of California and The Center for Environmental Inquiry at Sonoma State University, citizen scientists in Sonoma County are collecting bay laurel leaves to assist in controlling the pathogen responsible for Sudden Oak Death.

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Gathering Leaves (for show)

Published by KRCB North Bay Public Media. Also available at the following link:



Over 2,200 trees were sampled in Sonoma County. See Results here.


Video: SOD in Sonoma County

Oak ID

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SOD Results Map 2015

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SOD Program Poster

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