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Sudden Oak Death

UC Cooperative Extension-Humboldt/Del Norte provides general information about sudden oak death (SOD) caused by the pathogen Phytophthora ramorum. This page answers what sudden oak death is and provides information regarding disease locations and monitoring, FAQs, Guides and BMP's and Past SOD meetings.
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Sudden Oak Death FAQs

Frequently asked questions regarding sudden oak death including: What is sudden oak death or SOD? What plants are host to Phytophthora ramorum? What are the symptoms of Phytophthora ramorum? Who do I contact to learn more about regulations? Who do I contact if I suspect sudden oak death on or near my home or…
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Sudden Oak Death Disease Locations and Monitoring

Sudden oak death disease locations and monitoring in Humboldt and Del Norte Counties. Includes maps of confirmed SOD locations, spread risk maps, chronology of SOD-related tanoak mortality in Humboldt, Redwood Valley SOD infestation, and lab-confirmed disease locations from contributing groups.
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Northern Sierra Forests

Our forest and natural resources program seeks to provide the best and latest research-based information for all who live, work, and play in the forests of Plumas, Sierra, and Lassen counties.
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Central Sierra: Calendar

UC Central Sierra programming includes virtual and on-line training as well as in-person classes and workshops in Amador, Calaveras, El Dorado, and Tuolumne Counties.
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Forestry and Forest Health

Forest Advisor and County Director Yana Valachovic works with forest landowners and natural resource professionals, providing UC Forest Research and Outreach information about redwood and Douglas-fir silviculture, forest stewardship, watershed management, oak woodlands, fire and fuels, and insect and disease…
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