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Basic page: Sudden Oak Death: mechanisms of oak resistance to Phytophthora ramorum

The tree pathogen Phytophthora ramorum is an aggressive, apparently introduced fungal-like organism (oomycete) that causes sudden oak death (SOD). SOD has played a significant role in shaping the dynamics of the mixed evergreen forests of coastal California and southwestern Oregon, and, more recently, larch stands in the British Isles. P.