<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Hansen, E.M.</style></author><author><style face="normal" font="default" size="100%">Parke, J. L.</style></author><author><style face="normal" font="default" size="100%">Sutton, W.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Susceptibility of Oregon forest trees and shrubs to Phytophthora ramorum: a comparison of artificial inoculation and natural infection</style></title><secondary-title><style face="normal" font="default" size="100%">Plant Disease</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2005</style></year></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://apsjournals.apsnet.org/doi/abs/10.1094/PD-89-0063</style></url></web-urls></urls><number><style face="normal" font="default" size="100%">1</style></number><volume><style face="normal" font="default" size="100%">89</style></volume><pages><style face="normal" font="default" size="100%">63-70</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;&lt;em&gt;Phytophthora ramorum&lt;/em&gt; is an invasive pathogen in some mixed-hardwood forests in California and southwestern Oregon, where it causes sudden oak death (SOD) on some members of &lt;em&gt;Fagaceae, ramorum&lt;/em&gt; shoot dieback on some members of &lt;em&gt;Ericaceae&lt;/em&gt; and conifers, and &lt;em&gt;ramorum&lt;/em&gt; leaf blight on diverse hosts. We compared symptoms of &lt;em&gt;P. ramorum&lt;/em&gt; infection resulting from four different artificial inoculation techniques with the symptoms of natural infection on 49 western forest trees and shrubs; 80% proved susceptible to one degree or another. No single inoculation method predicted the full range of symptoms observed in the field, but whole plant dip came closest. Detached-leaf-dip inoculation provided a rapid assay and permitted a reasonable assessment of susceptibility to leaf blight. Both leaf age and inoculum dose affected detached-leaf assays. SOD and dieback hosts often developed limited leaf symptoms, although the pattern of midrib and petiole necrosis was distinctive. Stem-wound inoculation of seedlings correlated with field symptoms for several hosts. The results suggested that additional conifer species may be damaged in the field. Log inoculation provided a realistic test of susceptibility to SOD, but was cumbersome and subject to seasonal variability. Pacific rhododendron, salmonberry, cascara, and poison oak were confirmed as hosts by completing Koch’s postulates. Douglas-fir was most susceptible to shoot dieback shortly after budburst, with infection occurring at the bud.&lt;/p&gt;</style></abstract></record></records></xml>