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| Web URL(s): | https://www.plantmanagementnetwork.org/pub/trial/fntests/reports/2006/T025.pdf
Last checked: 11/14/2016
Requires: PDF Reader |
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| Publication Type:
| Report |
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| Author(s): | Burpee, L. L.;
Stephens, S. L.;
Martinez-Espinoza, A. D. |
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| Author Affiliation: | Department of Plant Pathology, University of Georgia, Griffin, Georgia |
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| Title: | Control of dollar spot caused by an isolate of Sclerotinia homoeocarpa exhibiting dual fungicide resistance, 2005 |
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| Section: | Turfgrass
Other records with the "Turfgrass" Section
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| Source: | F&N Tests. Vol. 61, 2006, p. T025. |
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| Publishing Information: | St. Paul, MN: American Phytopathological Society |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Agrostis stolonifera; Dollar spot; Disease control; Fungicide resistance; Disease severity; Application rates; Application timing
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| Cultivar Names: | Penncross |
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| Abstract/Contents: | "A fungicide trial was conducted on a 14-yr-old sward of creeping bentgrass grown on a sand/peat root zone (pH 6.2) at the Georgia Experiment Station. Fertilizer treatments consisted of 1.0 lb and 0.5 lb nitrogen (Lesco 24-4-10) per 1000 sq ft applied on 5 May and 1 Sep, respectively. The turfgrass was maintained at a height of 0.2-in. by mowing three times per week. Treatments were arranged as plots (3.3 ft x 5 ft) in a randomized complete block design with four replications. Initial fungicide applications were made on 13 Sep in 2.5 gal of water per 1000 sq ft with a wheel-mounted, CO2-pressured boom sprayer at 30 psi using XR TeeJet 8002vs nozzles. Subsequent applications were made at 14-, 21- or 28-day intervals from the initial application date. The turfgrass was inoculated with autoclaved tall fescue seed infested with S. Homoeocarpa (isolate SO138) six hours after the initial applications. Isolate SO138 exhibited dual resistance to thiophanate-methyl and DMI fungicides in laboratory assays. The plots received approximately 0.24-in. of irrigation water daily at 1700 hr to ensure nightly foliar wetness for infection. The Horsfall-Barratt rating scale was used to visually estimate disease severity at approximately 7-d intervals from the initial application date. Values were subjected to analysis of variance and means were statistically separated using the Scott-Knott cluster analysis procedure. Dollar spot severity was high, reaching a peak >50% disease in non-treated plots by 25 Oct. Throughout the study, all treatments, except 3336 Plus, provided statistically significant disease suppression. Treatments that provided acceptable dollar spot control (<3% disease) for the duration of the study were limited to Concert 4.3 SE (4.2 fl. oz. at 21 days), Emerald 70WG (0.13 oz. at 14 days) and Daconil Ultrex 82.5WG (3.25oz. at 14 days). No phytotoxicity was observed in any of the treated plots." |
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| Language: | English |
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| References: | 0 |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Burpee, L. L., S. L. Stephens, and A. D. Martinez-Espinoza. 2006. Control of dollar spot caused by an isolate of Sclerotinia homoeocarpa exhibiting dual fungicide resistance, 2005. F&N Tests. 61:p. T025. |
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| Web URL(s):
https://www.plantmanagementnetwork.org/pub/trial/fntests/reports/2006/T025.pdf
Last checked: 11/14/2016
Requires: PDF Reader |
| 
MSU catalog number: SB 951.3 .F82 |
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