Richard Turner, with the California Conservation Corps, cuts down a diseased bay laurel tree, which threatened old-growth oak trees, at the Los Trancos Open Space Preserve near Palo Alto, Calif ...

Some trees, like the California bay laurel, act a transmitters of the disease. For other trees, like tanoaks, die-off can start to occur in two to three years and is most always fatal.

Oak trees are seen on the hills off Santa Rosa Creek Road, bottom right, between Cambria and Highway 46 in 2011. Sudden oak death is attacking oak and bay laurel trees throughout California.

In fact, "three hosts (bay laurel, madrone and rhododendron) are the most dangerous for spreading SOD because the pathogen sporulates on their leaves," said Dave Rizzo, a forest pathologist from ...

An oak tree shows signs of the effect of Sudden Oak Death disease at the Los Trancos Open ... 2011. Crews from the California Conservation Corps are cutting down bay laurel trees carrying the S.

A bay laurel leaf that shows symptoms of sudden oak death along Todo El Mundo in Woodside on Dec. 13, 2024. Photo by Magali Gauthier. Oak trees near bay laurels along Todo El Mundo in Woodside on ...

In Marin, 31.9% of 561 trees surveyed were determined to be infected. That compares to a 4% infection rate in 2023, and a 5.2% infection rate in 2022.

The tree disease that exploded in Bay Area forests three decades ago, stunning residents with vast die-offs in parks and neighborhoods before slowing, has opened a new front with a second ...