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| Web URL(s): | http://apsjournals.apsnet.org/doi/pdfplus/10.1094/PDIS.2002.86.11.1240
Last checked: 08/26/2010
Requires: PDF Reader |
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| Publication Type:
| Refereed |
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| Author(s): | Miller, Gerald L.;
Stevenson, Katherine L.;
Burpee, Leon L. |
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| Author Affiliation: | Miller and Stevenson: Department of Plant Pathology, University of Georgia, Miller Plant Sciences Building, Athens, Georgia; Burpee: Department of Plant Pathology, University of Georgia, Georgia Experiment Station, Griffin, Georgia |
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| Title: | Sensitivity of Sclerotinia homoeocarpa isolates to propiconazole and impact on control of dollar spot |
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| Source: | Plant Disease. Vol. 86, No. 11, November 2002, p. 1240-1246. |
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| Publishing Information: | St. Paul, MN: American Phytopathological Society |
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| # of Pages: | 7 |
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| Keywords: | TIC Keywords: Propiconazole; Dollar spot; Sclerotinia homoeocarpa; Fenarimol; Myclobutanil; Triadimefon; Agrostis stolonifera; Fungus control; Disease control; DMI fungicides; Fungicidal resistance
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| Abstract/Contents: | "In response to reports of reduced efficacy of propiconazole for control of dollar spot, isolates of Sclerotinia homoecarpa were collected from several locations in Georgia and tested for sensitivity to propiconazole and other demethylation-inhibiting (DMI) fungicides. Two discriminatory concentrations of propiconazole (0.02 and 0.2 μg ml-1) were used to detect lower in vitro sensitivity in two populations that had been exposed repeatedly to propiconazole than in four nonexposed populations. Mean 50% effective concentration (EC50) values for a nonexposed population (baseline) and a DMI-exposed population were 0.0049 and 0.0283 μg ml-1, respectively. Positive correlations were significant among log10 EC50 values for propiconazole, fenarimol, and myclobutanil but not between triadimefon and any of the other three fungicides, indicating cross-resistance relationships in this pathogen may not be universal among the DMIs. In greenhouse experiments, propiconazole-treated bentgrass was inoculated with seven isolates of S. homoeocarpa differing in sensitivity to propiconazole. Incubation period decreased and relative area under the disease progress curve and disease severity 28 days after inoculation increased linearly with increasing log10 EC50 value of the isolate. Results of this study confirm a significant relationship between in vitro sensitivity of S. homoeocarpa and in planta control efficacy of propiconazole and provide evidence of field resistance to propiconazole in S. homoeocarpa in Georgia." |
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| Language: | English |
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| References: | 29 |
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| Note: | Tables
Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Miller, G. L., K. L. Stevenson, and L. L. Burpee. 2002. Sensitivity of Sclerotinia homoeocarpa isolates to propiconazole and impact on control of dollar spot. Plant Dis. 86(11):p. 1240-1246. |
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| Web URL(s):
http://apsjournals.apsnet.org/doi/pdfplus/10.1094/PDIS.2002.86.11.1240
Last checked: 08/26/2010
Requires: PDF Reader |
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MSU catalog number: SB 599 .P95 |
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