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Variation in susceptibility of Umbellularia californica (Bay Laurel) to Phytophthora ramorum

Meshriy, M., Hüberli, D., Harnik, T.Y., Miles, L., Reuther, K.D. and Garbelotto, M. (2006) Variation in susceptibility of Umbellularia californica (Bay Laurel) to Phytophthora ramorum. In: Sudden oak death second science symposium: the state of our knowledge, Pacific Southwest Research Station.

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    Abstract

    Bay laurel (Umbellularia californica) is an important foliar host in terms of spore production and transmission of disease. We designed a bioassay to screen for variation in susceptibility to Phytophthora ramorum among populations of bay laurel collected along the coast of California to southern Oregon and also from Yosemite. Mature leaves of bay laurel were inoculated with zoospores and nine days later lesions and infection percentage were measured. Results indicated that each population comprises trees of different susceptibility. Data from three separate trials indicated that trees from Oregon were less susceptible than those from California. There was little variation among populations from California. Seasonal variation in susceptibility of bay laurel to P. ramorum was observed among populations. It is hypothesized that the interaction of a number of factors are responsible for the observed variation in susceptibility including host resistance, genetic structure of host species in the forests, pathogen variation, and environmental conditions.

    Publication Type: Conference Paper
    Publisher: Forest Service, U.S. Department of Agriculture
    Copyright: public domain
    Notes: In: Frankel, Susan J.; Shea, Patrick J.; and Haverty, Michael I., tech. coords. Proceedings of the sudden oak death second science symposium: the state of our knowledge. Gen. Tech. Rep. PSW-GTR-196. Albany, CA: Pacific Southwest Research Station, Forest Service, U.S. Department of Agriculture: 87-89
    URI: http://researchrepository.murdoch.edu.au/id/eprint/2255
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