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Typical symptoms observed on different hosts of Phytophthora ramorum. (A) Bleeding canker of tanoak in the exposed inner bark (phloem) after removal of the outer bark: note typical lesions with clearly differentiated margins; (B) leaf tip necrosis or leaf spots on leaf margins of California bay laurel; (C) rhododendron—arrow marks necrosis of leaf petiole; (D) leaf necrosis on nursery ornamental rhododendron.
