Involvement of Phytophthora species in white oak (Quercus alba) decline in southern Ohio |
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| Authors: | Y Balci R P Long M Mansfield D Balser W L MacDonald |
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| Institution: | 1. Department of Plant Sciences and Landscape Architecture, University of Maryland, 2114 Plant Science Build, College Park, MD 20742, USA;2. E‐mail: ybalci@umd.edu (for correspondence);3. USDA Forest Service, Northern Research Station, Delaware, OH, USA;4. Department of Plant Pathology, The Pennsylvania State University, Pennsylvania, USA;5. Division of Forestry, Ohio Department of Natural Resources, Columbus, OH, USA;6. West Virginia University, Division of Plant and Soil Sciences, 1090 South Agricultural Science Building, Morgantown, WV 26506, USA |
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| Abstract: | This study was initiated to investigate the possible role of Phytophthora species in white oak decline (Quercus alba) in southern Ohio at Scioto Trail State Forest. Surveys demonstrated the presence of four species of Phytophthora including one novel species. By far, the most common species was P. cinnamomi; P. citricola and P. cambivora were isolated infrequently. In few instances, P. cinnamomi was isolated from fine roots and necroses on larger roots. No special pattern of incidence was found, but P. cinnamomi was more commonly isolated from greater Integrated Moisture Index values suggesting moist lower bottomlands favour this Phytophthora species. When tree crown condition was examined relative to the presence of Phytophthora, no significant association was found. However, roots of declining P. cinnamomi‐infested trees had 2.5 times less fine roots than non‐infested and healthy trees, which was significantly different. The population densities of P. cinnamomi from declining trees were significantly greater than from healthy trees, suggesting increased pathogen activity that has the potential to cause dieback and decline and possibly the cause of a reduced fine root amount found on declining trees. |
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