Pacific Southwest

Title: Monitoring Phytophthora ramorum and P. kernoviae in soil and rainwater samples collected at two sites on a cornish estate

Author: Lockley, David; Turner, Judith; Humphries, Gillian; Jennings, Phil

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. 389-391

Station ID: GTR-PSW-214

Description: Soil samples were collected from quadrats marked out below the canopies of two rhododendrons, one infected by Phytophthora ramorum (Site 1) and the other (Site 2) infected by Phytophthora kernoviae and P. ramorum. Rainwater was collected in high-level and low level traps. Soil and rainwater were sampled at roughly monthly intervals from November 2003 until April 2006, and tested for the presence of P. ramorum and P. kernoviae at the Central Science Laboratory. The infected rhododendrons were removed in May 2004 (Site 1) and July 2004 (Site 2) after which the quadrats and rain traps were reinstated. P. ramorum was initially detected in soil from less than a third of the quadrats at Site 1 and declined to very low levels after removal of the host. All rainwater samples at Site 1 were negative for P. ramorum. At Site 2, oth P. ramorum and P. kernoviae were initially readily found in soil samples. After removal of the host, levels of P. kernoviae in the soil declined rapidly, but P. ramorum was still detected in a relatively high proportion of soil samples for up to 21 months. P. ramorum was found in rain traps at Site 2 over the winter of 2006, indicating an influx of wind blown spores. Rhododendron leaf baits buried in the soil at Site 2 frequently became infected by P. ramorum for up to 21 months after removal of the infected host.

Keywords: Phytophthora ramorum, Phytophthora kernoviae, soil, rainwater, rhododendron

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Citation

Lockley, David; Turner, Judith; Humphries, Gillian; Jennings, Phil   2008.  Monitoring Phytophthora ramorum and P. kernoviae in soil and rainwater samples collected at two sites on a cornish estate.   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. 389-391.