Sudden Oak Death

Oak trees are one of my favorite things. They offer habitat, shade and are crucial to soil development, watershed health, and recreation. Oak trees are hearty, surviving dry summers for hundreds of years. Their two main threats in California are poor regeneration and Sudden Oak Death.

Sudden Oak Death is a forest disease that was first noticed to infect trees in central California in the 1990’s.  Many trees, shrubs and plants are affected but the pathogen gets its name from the death is causes in tanoak, coast live oak, Shreve’s oak, California black oak, and canyon live oak. It also occurs in other parts of the world including Belgium, Netherlands, Germany, Spain, France, Poland, Sweden, Italy and the UK. The disease causes a variety of leaf and trunk problems, and often mortality.

This map can show you where Sudden Oak Death can be found in California :

Below is a link to a great blog article regarding one of California’s most concerning forest pathogens Sudden Oak Death. Previously, Northern Humboldt County has not been severely impacted by the disease. This blog from Forest Research and Outreach written by the University of California Cooperative Extension Forestry has some interesting updates regarding Sudden Oak Death in Northern California.

Please follow the link below to read the article by Yana Valachovic, Forest Advisor and Humboldt – Del Norte County Director for University of California Agriculture and Natural Resources can be found through this link: Local Agencies & Landowners Team up to Stop Sudden Oak Death (SOD) Spread in Humboldt County

For more information about Sudden Oak Death visit:

To learn more about University of California Agriculture and Natural Resources that aims to ‘”deliver healthy food systems, healthy environments,  healthy communities and healthy Californians” follow this link:


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