California Oak Mortality is a serious disease affecting oak trees in California, primarily caused by the pathogen Phytophthora ramorum. This disease leads to the decline and death of oak trees, particularly the coast live oak and black oak species, disrupting local ecosystems and affecting wildlife that depend on these trees. The disease spreads through soil, water, and infected plant material, making it challenging to control. Efforts to manage California Oak Mortality include monitoring infected areas, educating the public about prevention, and promoting the health of oak forests to mitigate the impact of this devastating disease.