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The key host for an invasive forest pathogen also facilitates the pathogen’s survival of wildfire in California forestsAuthor(s): Maia M. Beh; Margaret R. Metz; Kerri M. Frangioso; David M. Rizzo
Source: New Phytologist 196(4):1145-54
Publication Series: Scientific Journal (JRNL)
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- The first wildfires in sudden oak death-impacted forests occurred in 2008 in the Big Sur region of California, creating the rare opportunity to study the interaction between an invasive forest pathogen and a historically recurring disturbance.
- To determine whether and how the sudden oak death pathogen, Phytophthora ramorum, survived the wildfires, we completed intensive vegetation-based surveys in forest plots that were known to be infested before the wildfires. Wethen used 24 plot-based variables as predictors of P. ramorum
- The likelihood of recovering P. ramorum from burned plots was lower than in unburned plots both 1 and 2 yr following the fires. Post-fire recovery of P. ramorum in burned plots was positively correlated with the number of pre-fire symptomatic California bay laurel (Umbellularia californica), the key sporulating host for this pathogen, and negatively correlated with post-fire bay laurel mortality levels.
- Patchy burn patterns that left green, P. ramorum-infected bay laurel amidst the charred landscape may have allowed these trees to serve as inoculum reservoirs that could lead to the infection of newly sprouting vegetation, further highlighting the importance of bay laurel in the sudden oak death disease cycle.
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CitationBeh, Maia M.; Metz, Margaret R.; Frangioso, Kerri M.; Rizzo, David M. 2012. The key host for an invasive forest pathogen also facilitates the pathogen’s survival of wildfire in California forests. New Phytologist 196(4):1145-54. Doi: 10.1111/j.1469-8137.2012.04352
KeywordsBig Sur, interacting disturbances, invasive forest pathogen, Phytophthora ramorum, sudden oak death (SOD), Umbellularia californica, wildfire.
- Apparent competition in canopy trees determined by pathogen transmission rather than susceptibility.
- Summer survival of Phytophthora ramorum in California bay laurel leaves
- Pathogenicity variation in two west coast forest Phytophthoras, Phytophthora nemorosa and P. pseudosyringae, to bay laurel
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