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| Web URL(s): | https://archive.lib.msu.edu/tic/its/articles/2001jou645.pdf
Last checked: 09/29/2008
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| Publication Type:
| Refereed |
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| Author(s): | Burpee, L. L. |
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| Author Affiliation: | Department of Plant Pathology, University of Georgia, Griffin, GA |
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| Title: | Growth of Sclerotinia homoeocarpa as affected by repeated exposure to propiconazole |
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| Section: | Turfgrass diseases
Other records with the "Turfgrass diseases" Section
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| Meeting Info.: | Toronto, Ontario, Canada: July 2001 |
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| Source: | International Turfgrass Society Research Journal. Vol. 9, No. Part 2, 2001, p. 645-648. |
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| Publishing Information: | Oakville, Ontario, Canada: International Turfgrass Society |
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| # of Pages: | 4 |
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| Keywords: | TIC Keywords: Sclerotinia homoeocarpa; Propiconazole; DMI fungicides; Dollar spot; Fungicide resistance; Electrical conductivity; Golf greens; Golf fairways; Agrostis stolonifera
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| Abstract/Contents: | "Reduced efficacy of demethylation (DMI) fungicides for control of dollar spot, caused by Sclerotinia homoeocarpa F. T. Bennet, has been observed on golf greens and fairways in several regions of the United States. Strains of S. homoeocarpa that exhibit reduced DMI sensitivity were recovered from these sites, suggesting that fungicide selection pressure had shifted the pathogen population from DMI sensitive to resistant. The present study was conducted to determine how repeated exposure to the DMI fungicide, propiconazole, affected the growth and fungicide sensitivity of two propiconazole sensisitive isolates (SO84 and SO115) of S. homoeocarpa. Changes in sensitivity to propiconazole were assessed by comparing the fungicide's EC50 values for serially exposed cultures with non-serially exposed cultures of each isolate. During serial exposure to 0.2 μg m1-1 propiconazole, both isolates formed mycelial sectors that grew more rapidly than adjacent mycelia, and colony diameters were larger for serially exposed cultures than for non-serially exposed controls. Isolate SO115 responded similarly during serial exposure to a 0.3 μg m1-1 concentration, but colonies of isolate SO84 were smaller and had few sectors compared to controls. Based on ED50 values, the culture of isolate SO115 that was serially exposed to 0.3 μg m1-1 propiconazole exhibited a significant (α ≤ 0.05) decrease in sensitivity to the fungicide. However, this was not evident for the culture of isolate SO115 exposed to the 0.2 μg m1-1 concentration, or for cultures of isolate SO84 exposed to either concentration. The reduced sensitivity detected in the serially exposed culture of isolate SO115 was 10X less than that exhibited by an isolate (SO88) recovered from a field site where propiconazole efficacy was limited. The results of this study show that, for the isolates and rates of fungicide tested, highly resistant strains of S. homoeocarpa were not selected by serial exposure to propiconazole in vitro. These findings suggest that DMI resistant populations in S. homoeocarpa are not readily derived from the selection of resistant mycelial cells that may exist, in low numbers, within sensitive strains of the fungus." |
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| Language: | English |
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| References: | 13 |
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| Note: | Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Burpee, L. L. 2001. Growth of Sclerotinia homoeocarpa as affected by repeated exposure to propiconazole. Int. Turfgrass Soc. Res. J. 9(Part 2):p. 645-648. |
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https://archive.lib.msu.edu/tic/its/articles/2001jou645.pdf
Last checked: 09/29/2008
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MSU catalog number: SB 433 .I52 v. 9 |
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