Sudden Oak Death is a recently introduced pathogen that is dramatically changing many of California's landscapes. Coast live oaks and Tanoaks are particularly vulnerable to the disease though tens if not hundreds of woodland species are affected by the pathogen. California Bay Laurel trees are the single largest botanical vector for spread of the disease through woodlands because although they usually survive infection, an infected individual produces and releases staggering numbers of motile zoospores of the Oomycete Phytophthora ramorum during the rainy season, serving as a reservoir for the pathogen and passing the infection on to other members of the community.

Symposium: "The Sudden Oak Death Third Science Symposium"
Susceptibility to Phytophthora ramorum in California bay laurel, a key foliar host of sudden oak death
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Symposium: "The State of Our Knowledge"
Variation in Susceptibility of Umbellularia californica (bay laurel) to Phytophthora ramorum
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Phenotypic variation among Phytophthora ramorum isolates from California and Oregon
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Paper: "Susceptibility to Phytophthora ramorum in a key ingectious host: landscape variation in host genotype,
host phenotype, and environmental factors
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Paper: "Pittosporum undulatum is a potential Australian host of Phytophthora ramorum"
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