Pacific Southwest

Title: Summer survival of Phytophthora ramorum in California bay laurel leaves

Author: Fichtner,Elizabeth J.; Rizzo, David M.; Lynch, Shannon C.; Davidson, Jennifer ; Buckles, Gerri; Parker, Jennifer

Date: 2008

Source: In: Frankel, Susan J.; Kliejunas, John T.; Palmieri, Katharine M., tech. coords. 2008. Proceedings of the sudden oak death third science symposium. Gen. Tech. Rep. PSW-GTR-214. Albany, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Research Station. pp. 357-358

Station ID: GTR-PSW-214

Description: Sudden oak death manifests as non-lethal foliar lesions on bay laurel (Umbellularia californica), which support sporulation and survival of Phytophthora ramorum in forest ecosystems. Infected bay laurel leaves are more likely to abscise than uninfected leaves, resulting in an accumulation of inoculum at the forest floor. The pathogen survives the dry summers in a proportion of attached bay leaves, but the histology of colonization during the survival phase and the propagules responsible for survival are unknown. This study focuses on summer pathogen survival associated with bay laurel in redwood-tanoak and mixed evergreen forests with specific objectives including: i) detection of P. ramorum in leaf litter and soils throughout summer, ii) quantification of chlamydospores on and within attached symptomatic leaves, and in fresh and aged litter, iii) determination f chlamydospore germination, and, iv) assessment of pathogen survival within litter and canopy leaves, addressing the location of viable inoculum within foliar tissues.

Keywords: Phytophthora ramorum, Umbellularia californica, survival

View and Print this Publication (133 KB)

Publication Notes: 

• We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
• This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
• You may send email to pubrequest@fs.f ed.us to request a hard copy of this publication. (Please specify exactly which publication you are requesting and your mailing address.)

 Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility

Citation

Fichtner,Elizabeth J.; Rizzo, David M.; Lynch, Shannon C.; Davidson, Jennifer ; Buckles, Gerri; Parker, Jennifer   2008.  Summer survival of Phytophthora ramorum in California bay laurel leaves.   In: Frankel, Susan J.; Kliejunas, John T.; Palmieri, Katharine M., tech. coords. 2008. Proceedings of the sudden oak death third science symposium. Gen. Tech. Rep. PSW-GTR-214. Albany, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Research Station. pp. 357-358.