Sudden Oak Death is a disease caused by the pathogen Phytophthora ramorum, which affects various oak species and other plants. It was first identified in California in the 1990s and has since spread to several other states. The disease leads to symptoms like leaf wilting, dark lesions on the bark, and ultimately tree death. The spread of Sudden Oak Death is facilitated by wet conditions and can occur through soil, water, or infected plant material. Efforts to manage the disease include monitoring affected areas, removing infected trees, and promoting healthy forest practices to prevent further outbreaks.