<?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%">Peterson, Ebba K.</style></author><author><style face="normal" font="default" size="100%">Rupp, Franziska</style></author><author><style face="normal" font="default" size="100%">Eberhart, Joyce</style></author><author><style face="normal" font="default" size="100%">Parke, Jennifer L.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Root Rot of Juniperus and Microbiota by Phytophthora lateralis in Oregon Horticultural Nurseries</style></title><secondary-title><style face="normal" font="default" size="100%">Plant Disease</style></secondary-title><short-title><style face="normal" font="default" size="100%">Plant Disease</style></short-title></titles><dates><year><style  face="normal" font="default" size="100%">2020</style></year><pub-dates><date><style  face="normal" font="default" size="100%">Jan-05-2020</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">https://apsjournals.apsnet.org/doi/10.1094/PDIS-04-19-0808-RE</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">104</style></volume><pages><style face="normal" font="default" size="100%">1500 - 1506</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;Widespread symptoms of root rot and mortality on &lt;em&gt;Juniperus communis&lt;/em&gt; and &lt;em&gt;Microbiota decussata&lt;/em&gt; were observed in two horticultural nurseries in Oregon, leading to the isolation of a &lt;em&gt;Phytophthora&lt;/em&gt; sp. from diseased roots. Based on morphology and sequencing the internal transcribed spacer ITS1-5.8S-ITS2 region, isolates were identified as the invasive pathogen &lt;em&gt;Phytophthora lateralis&lt;/em&gt;, causal agent of Port-Orford-cedar (POC; &lt;em&gt;Chamaecyparis lawsoniana&lt;/em&gt;) root disease. Additional sequencing of the cytochrome c oxidase subunit 1 and 2 genes identified all isolates as belonging to the PNW lineage. Utilizing recovered isolates plus a POC-wildlands isolate and susceptible POC as controls, we completed Koch's postulates on potted &lt;em&gt;Juniperus&lt;/em&gt; and &lt;em&gt;Microbiota&lt;/em&gt; plants. Nursery isolates were more aggressive than the forest isolate, which was used in the POC resistance breeding program. Increased aggressiveness was confirmed using a branch stem dip assay with four POC clones that differed in resistance, although no isolate completely overcame major-gene resistance. Isolates were sensitive to mefenoxam, a fungicide commonly used to suppress &lt;em&gt;Phytophthora&lt;/em&gt; spp. growth in commercial nurseries. Although POC resistance is durable against these more aggressive nursery isolates, the expanded host range of &lt;em&gt;P. lateralis&lt;/em&gt; challenges POC conservation through the continued movement of &lt;em&gt;P. lateralis&lt;/em&gt; by the nursery industry.&lt;/p&gt;</style></abstract><issue><style face="normal" font="default" size="100%">5</style></issue></record></records></xml>