How susceptible are canyon live oaks to Phytophthora ramorum?

Canyon live oak is an intermediate oak, meaning it is between the red and white oak groups. P. ramorum/SOD primarily infects only red oaks; however, it does also affect the intermediary canyon live oak.  In northern California (Humboldt County), canyon live oak infected with P. ramorum leads to dieback of large branches. In the Bay Area, large canyon live oaks have been found dying from P. ramorum/SOD.  If you are in central coastal California in an area known to have SOD and canyon live oaks are present with California bay laurels nearby, consider clearing bays (even the little ones) within 20 feet of large (> 1 foot diameter) individuals.

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