Terrible news for the Coast Live Oak and Tanbark Oak of our County. CNPS was a major contributor to the collection of leaves on possibly suspect oak and bay trees. Locally organized by CNPS’ Lauren Brown and Cal Fire’s Kim Corella , volunteers sampled bay trees as ‘carriers’ of the disease’s spores, which up to this year did not come south of Monterey County. The leaves were sent up to the labs in the Bay Area, and for the first time there were a large number of infections found, especially along Santa Rosa Creek. Other sites were Vineyard Drive, Cypress Mt. Rd., the west side of Atascadero, Cal Poly in Stenner Creek amd Leaning Pine Arboretum and on Prefumo Canyon Rd. This was a major shock, primarily because of the breadth of the newly found infections.
There is no cure. Prevention is through good sanitation in limiting the transport of spores. To learn more about the visible symptoms on infected leaves, go to the SOD website: https://nature.berkeley.edu/garbelottowp/
Image is of the Bay tree, courtesy of Marlin Harms