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Phytophthora ramorum: the causal agent of sudden oak death in California. This pathogen affects understorey shrubs, such as rhododendron, where it proliferates and is easily transmitted to infect living trees in the vicinity

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Phytophthora ramorum: the causal agent of sudden oak death in California. This pathogen affects understorey shrubs, such as rhododendron, where it proliferates and is easily transmitted to infect living trees in the vicinity


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Credit line: Forestry Commission

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