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Phytophthora ramorum Werres et al., 2001
has sporangia which resemble those of P. palmivora. In North America, it causes the important lethal canker disease sudden oak death in tanoak (Lithocarpus densiflora), coast live oak (Quercus agrifolia), Californian black oak (Quercus kelloggii), and possibly Canyon live oak (Quercus chrysolepis). The disease has killed millions of trees. In 2005 more than 200,000 dead standing trees were found just in the Big Sur region of California. It also causes leaf blight and dieback (ramorum blight) on various other plants, e.g. in Rhododendron. It appears that the fungus is native to Europe and has spread to California around 1990, possibly via infected ornamentals.
For details see the respective page in Wikipedia.
The literature database currently contains 235 publications for Phytophthora ramorum.
(See box above/on left.)