Phytophthora ramorum isolated from California bay laurel inflorescences and mistletoe: possible implications relating to disease spread

Abstract

Since 2005, we have been studying the spread and development of Phytophthora ramorum at a Christmas tree farm near Los Gatos, California. This research has shown that distance from infected plants, predominantly California bay laurel (Umbellularia californica) (referred to as ?bay? throughout), is an important factor relating to the infection of Douglas-fir (Pseudotsuga menziesii) and grand fir (Abies grandis) Christmas trees at our research site. This abstract reports two case studies involving the possible role that bay inflorescences and mistletoe may play in the spread of P. ramorum.

Parent Publication

• Proceedings of the sudden oak death third science symposium

Citation

Chastagner, Gary A.; Riley, Kathy; Dart, Norm. 2008. Phytophthora ramorum isolated from California bay laurel inflorescences and mistletoe: possible implications relating to disease spread. 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. 169-171