A disease outbreak is killing Bay Area trees
A mass tree dieback has spread through the East Bay hills and Peninsula over the last several months, affecting both native and nonnative trees. … The first eight months of the 2020-2021 rainfall year constitute one of the driest starts on record in the Bay Area, and the last two years together are on track to be the second driest two-year stretch dating back to 1850 in San Francisco … Last year was also the warmest ever recorded in California. But the nature and spread of the tree dieback made researchers suspect more than just drought as the killer.