Phytophthora Species Causing Tanoak Stem Cankers in Southwestern Oregon
نویسندگان
چکیده
منابع مشابه
Correlating Phytophthora ramorum Infection Rate and Lesion Expansion in Tanoak
To date, resistance to Phytophthora ramorum in its most susceptible hosts has most commonly been quantified by lesion growth, after wounding or non-wounding inoculations via mycelia or high concentrations of zoospores. However, even highly susceptible hosts may not always become infected when they are exposed to a pathogen under ecologically realistic conditions. Therefore, resistance quantifie...
متن کاملRegeneration of Oaks and Tanoak in Phytophthora ramorum-Affected Forests
Recent mortality in coast live oak (Quercus agrifolia), California black oak (Q. kelloggii), and tanoak (Lithocarpus densiflorus) exceeds historical levels in forests affected by the pathogen Phytophthora ramorum. We assessed the balance between recent mortality and seedling populations in these species to examine the status of regeneration in stands with varying levels of mortality caused by P...
متن کاملPhytophthora ramorum Colonizes Tanoak Xylem and Is Associated with Reduced Stem Water Transport.
ABSTRACT Isolation, detection with diagnostic polymerase chain reaction (PCR), and microscopy demonstrated the presence of Phytophthora ramorum in the sapwood of mature, naturally infected tanoak (Lithocarpus densiflorus) trees. The pathogen was strongly associated with discolored sapwood (P < 0.001), and was recovered or detected from 83% of discolored sapwood tissue samples. Hyphae were abund...
متن کاملThe Phytophthora species assemblage and diversity in riparian alder ecosystems of western Oregon, USA.
Phytophthora species were systematically sampled, isolated, identified and compared for presence in streams, soil and roots of alder (Alnus species) dominated riparian ecosystems in western Oregon. We describe the species assemblage and evaluate Phytophthora diversity associated with alder. We recovered 1250 isolates of 20 Phytophthora species. Only three species were recovered from all substra...
متن کاملPhytophthora Species in Rivers and Streams of the Southwestern United States.
UNLABELLED Phytophthora species were isolated from rivers and streams in the southwestern United States by leaf baiting and identified by sequence analysis of internal transcribed spacer (ITS) ribosomal DNA (rDNA). The major waterways examined included the Rio Grande River, Gila River, Colorado River, and San Juan River. The most prevalent species identified in rivers and streams were Phytophth...
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ژورنال
عنوان ژورنال: Plant Disease
سال: 2008
ISSN: 0191-2917,1943-7692
DOI: 10.1094/pdis-92-8-1252b