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| DOI: | 10.1094/PHYTO.2009.99.6.S191 |
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| Web URL(s): | http://apsjournals.apsnet.org/doi/pdf/10.1094/PHYTO.2009.99.6.S191#page=4
Last checked: 06/11/2009
Requires: PDF Reader
Notes: Item is within a single large file |
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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Popko, J. T.;
Ban, J.;
Jung, G. |
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| Author Affiliation: | Department of Plant, Soil, and Insect Sciences, University of Massachusetts-Amherst, Amherst, Massachusetts |
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| Title: | The effect of rate and spray interval of demethylation inhibitor fungicides on an insensitive population of Sclerotinia homoeocarpa on a golf course fairway |
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| Section: | 2008 Northeastern Division meeting abstracts
Other records with the "2008 Northeastern Division meeting abstracts" Section
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| Meeting Info.: | Newport, Rhode Island: October 8-10, 2008 |
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| Source: | Phytopathology. Vol. 99, No. 6, June Supplement 2009, p. S194-S195. |
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| Publishing Information: | St. Paul, MN: American Phytopathological Society |
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| # of Pages: | 2 |
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| Keywords: | TIC Keywords: Dollar spot; Sclerotinia homoeocarpa; Spraying; Application rates; Disease control; Golf fairways; Fungicide application; DMI fungicides; Fungicide resistance
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| Abstract/Contents: | "Dollar spot, caused by Sclerotinia homoeocarpa, is the most rampant and economically important turfgrass disease in the North America. The disease is primarily controlled by preventive or curative fungicide application. Sterol demethylation inhibitor (DMI) fungicides are among the most effective and widely used in the United States. Fungicide resistance to the demethylation inhibitor chemical class has been confirmed in dollar spot and exhibits a gradual populations shift toward insensitivity to DMI fungicides. Previous research has yet to pinpoint the duration of DMI field efficacy on insensitive dollar spot populations. This project aims to correlate DMI field efficacy to in-vitro fungicide sensitivity values, while examining the effect of fungicide rate and spray interval. Treatments were arranged in a randomized complete block design with three replications on an Agrostis stoloniferous and Poa annua fairway maintained at 0.50 inch mowing height. Treatments of two DMIs, propiconazole and triticonazole were applied every 12, 21 and 28 days at rates of 1.0/2.0 oz/1000 ft2 and 0.5/1.0 oz/1000 ft2, respectively. Chlorothalonil was applied every 14 days at 5.5 oz/1000 ft2 rate in order to exemplify acceptable control. 396 samples were taken prior to DMI application this summer and revealed an average of 52.25% ^D+- 14.29 relative mycelial growth on potato dextrose agar amended with a single discriminatory concentration (0.1 μg a.i./ml) of propiconazole. All DMI treatments showed a reduction in number of dollar spot infection centers 7 days after application, but infection center totals increased 14 days after application. A dose-rate effect was also observed in all DMI treatments, increased active ingredient did show a reduction in dollar spot infection centers for both DMIs. The AUDPC of infection centers over 8 ratings from plots treated with 2.0 oz/1000ft2 of propiconazole on 14 and 21 day intervals were statistically similar to plots treated with chlorothalonil." |
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| Language: | English |
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| References: | 0 |
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| Note: | This item is an abstract only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Popko, J. T., J. Ban, and G. Jung. 2009. The effect of rate and spray interval of demethylation inhibitor fungicides on an insensitive population of Sclerotinia homoeocarpa on a golf course fairway. Phytopathology. 99(6):p. S194-S195. |
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| DOI: 10.1094/PHYTO.2009.99.6.S191 |
| Web URL(s):
http://apsjournals.apsnet.org/doi/pdf/10.1094/PHYTO.2009.99.6.S191#page=4
Last checked: 06/11/2009
Requires: PDF Reader
Notes: Item is within a single large file |
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MSU catalog number: b2219736a |
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