Abstract
Western Australia is renowned as a region of exceptional plant species richness—more than 7,000 species of native vascular plants occur in the state (19), and of these, over 3,000 are endemic (30). The native plant communities in the southwestern part of the state are also the setting for what has been described as “a biological disaster of global significance for conservation of areas of great biodiversity and a major problem for wood based and extractive industries” (42). The cause of this “disaster” is Phytophthora root and collar rot (PRCR) disease, with Phytophthora cinnamomi being the predominant pathogen. This pathogen directly affects over 2,000 of the 7,000 native species (59), and its indirect effects are still to be elucidated.
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