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Abstract
Phytophthora ramorum can produce spores on dozens of native California plant species, but the most important vector for infection of oak (
Quercus) is California bay laurel (
Umbellularia californica). Presence of bay laurel is associated with increased infection of oaks and it is the most common tree species that co-occurs with coast live oak
(Quercus agrifolia) in northern California woodlands. Understanding the interaction between
P. ramorum and bay laurel is critical to predicting dynamics of disease establishment in mixed oak woodlands. Previous studies showed that
P. ramorum lesion growth and expression of
P. ramorum symptoms depends on environmental factors and on bay laurel genotype. However, these studies did not measure susceptibility to infection by
P. ramorum spores on the leaf surface. In addition, they did not work with pathogen isolates that had been cleared of all microbial associates.
Parent Publication
Citation
Johnston, Steve; Rank, Nathan; Cohen, Michael; Meentemeyer, Ross. 2010. California bay laurel susceptibility to
Phythophthora ramorum depends upon season, leaf age, and fungal load. In: Frankel, Susan J.; Kliejunas, John T.; Palmieri, Katharine M. 2010. Proceedings of the Sudden Oak Death Fourth Science Symposium. Gen. Tech. Rep. PSW-GTR-229. Albany, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Research Station. pp. 89-92
