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Web URL(s): | http://apsjournals.apsnet.org/doi/pdf/10.1094/PHYTO.2008.98.6.S9#page=72 Last checked: 10/20/2015 Requires: PDF Reader Notes: Item is within a single large file |
Publication Type:
| Report |
Content Type: | Abstract or Summary only |
Author(s): | Kerns, J. P.;
Tredway, L. P. |
Author Affiliation: | Kerns: Department of Plant Pathology, University of WisconsinMadison; Tredway: Department of Plant Pathology, North Carolina State University |
Title: | Impact of temperature on virulence of Pythium volutum toward creeping bentgrass |
Source: | Phytopathology. Vol. 98, No. 6, June Supplement 2008, p. S80. |
Publishing Information: | St. Paul, MN: American Phytopathological Society |
# of Pages: | 1 |
Keywords: | TIC Keywords: Pythium volutum; Pythium-induced root dysfunction; Temperatures; Agrostis stolonifera; Disease severity
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Abstract/Contents: | "Symptoms of Pythium root dysfunction (PRD) in creeping bentgrass are most common in the summer during periods of heat and drought stress. However, our observations indicate that Pythium volutum, a causal agent of PRD, is most active during the fall and spring. A mycelial growth assay was performed by incubating 11 P. volutum isolates at 10C, 12C, 14C, 18C, 22C, 24C, 26C, 28C, and 31C. To determine the optimal temperature range for infection by P. volutum, mature 'A1' creeping bentgrass plants were inoculated with one of 5 P. volutum isolates. Inoculated plants were transferred to growth chambers at constant 12C, 16C, 20C, 24C, 28C or 32C (12 hr day/night cycles), then the temperature in all chambers was increased to 32C/26C day/night to induce foliar symptoms. Growth assays demonstrated that P. volutum grows best when temperatures are between 18C and 26C. Typical PRD foliar symptoms developed in the 12C, 16C, 20C and 24C treatments two weeks after the temperature in all growth chambers was elevated to 32C/26C day/night. Severity of PRD was greatest when P. volutum infects creeping bentgrass roots at 16C. Reductions in root depth and/or root mass were observed prior to raising the temperature to 32C/26C in the 12C, 16C, and 20C temperature treatments. Once the temperature was elevated, extensive root dieback occurred at 12C, 16C, 20C, and 24C. These results demonstrate that P. volutum is most active at temperatures prevalent during the fall and spring in NC, supporting our hypothesis that the majority of root infection occurs during this time." |
Language: | English |
References: | 0 |
Note: | This item is an abstract only! |
| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete): Kerns, J. P., and L. P. Tredway. 2008. Impact of temperature on virulence of Pythium volutum toward creeping bentgrass. Phytopathology. 98(6):p. S80. |
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| Web URL(s): http://apsjournals.apsnet.org/doi/pdf/10.1094/PHYTO.2008.98.6.S9#page=72 Last checked: 10/20/2015 Requires: PDF Reader Notes: Item is within a single large file |
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