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| Web URL(s): | https://www.plantmanagementnetwork.org/pub/trial/PDMR/reports/2011/T028.pdf
Last checked: 11/14/2016
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| Publication Type:
| Report |
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| Author(s): | Smith, D. L.;
Walker, N. R. |
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| Author Affiliation: | Department of Entomology and Plant Pathology, Oklahoma State University, Stillwater, OK |
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| Title: | Evaluation of fungicide programs for the management of dollar spot and brown patch of creeping bentgrass, 2010 |
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| Section: | Turfgrass
Other records with the "Turfgrass" Section
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| Source: | PDMR: Plant Disease Management Reports. Vol. 5, 2011, p. T028. |
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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: Agrostis stolonifera; Disease control; Dollar spot; Fungicide efficacy; Fungicide evaluation; Fungicide programs; Rhizoctonia blight; Rhizoctonia solani; Sclerotinia homoeocarpa; Turfgrass quality
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| Cultivar Names: | Penncross |
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| Abstract/Contents: | "This trial was conducted to evaluate the efficacy of fungicide programs for the control of dollar spot and brown patch of creeping bentgrass putting greens in Oklahoma. Plots were established on a creeping bentgrass putting green at the Turfgrass Research Center located in Stillwater, OK. Plots were 3 ft wide and 5 ft long with 1-ft alleys between plots. The experimental design was a randomized complete block with four replicates. The turfgrass sward was a mature stand of creeping bentgrass established on a USGA sand/peat mix soil. Recommended maintenance and irrigation practices were followed throughout the growing season. Fungicide applications were initiated on 1 April for BAYER 1 and BAYER 2 treatments, 9 April for BASF 1 and BASF 2 treatments, and 23 April for all other treatments and were applied using 14-day intervals with the exception of the ADVISORY treatment. For the ADVISORY treatment, sprays were applied according to a regression-based disease prediction model developed for dollar spot (developed at Oklahoma State University). Additional programs were included from Cleary Chemical (CLEARY); and three alternative programs (OSU 1, OSU 2, and OSU 3). A non-fungicide treated control was also included. Fungicides were applied with a CO2-pressurized wheelbarrow sprayer equipped with TX8008 flat fan nozzles and calibrated to deliver 87 gal/A or 2 gal/1,000 sq ft. Ratings of the number of dollar spot foci, percent of plot with symptoms of brown patch, and turfgrass quality (scale of 1 - 9 where 1 = no turf present, 5 = unacceptable turfgrass, 6 = acceptable turf, 9 = dense, dark color, thick stand of turfgrass) were taken at 7- to 10-day intervals from 1 Apr to 17 Sep. Dollar spot and brown patch disease data were subjected to the area under the disease progress curve transformation to account for season-long ratings. These data and average turf quality data were analyzed using ANOVA (α = 0.05). Multiple comparisons of means were performed using Fishers test of protected least significant difference (α = 0.05). Weather conditions early in the evaluation period were cool, with high humidity, and excessive precipitation. Weather was hot and dry for the last half of the growing season. Weather conditions resulted in high levels of dollar spot early in the season, which gave way to high levels of brown patch mid-to-late season. Mean counts of dollar spot foci on 7 May were greatest for the non-treated check (58 foci), while lowest counts were recorded in plots sprayed according to BASF 1 (0 foci) and BASF 2 (0 foci) programs. Plots treated according to BASF 2, BAYER 2, and BASF 1 programs had the lowest levels of dollar spot throughout the season and were not significantly different from each other. OSU 1, CLEARY, BAYER 1, and ADVISORY programs had significantly higher levels of dollar spot than BASF 2 and BAYER 2 programs, but were not significantly different from each other. Of plots treated with fungicide, highest levels of dollar spot were recorded throughout the season in the OSU 2 program followed by the OSU 3 program. Highest levels of brown patch were recorded on 17 Sep with non-treated check plots having the greatest mean disease severity (80%), while lowest levels of mean disease severity were recorded in plots sprayed according to the OSU 2 program (0%). Highest levels of season-long brown patch were recorded in plots not treated with fungicide. Significantly lower levels of brown patch were recorded in plots treated according to the ADVISORY program. All other plots treated with fungicide had significantly lower levels of brown patch and were not different from each other. Average turfgrass quality was lowest in plots not treated with fungicide and was considered unacceptable. Marginally higher levels of quality were recorded in the plots treated by the ADVISORY and OSU 2 programs, while the OSU 3 program had similar average quality to the OSU 2 program. Plots treated with the BAYER 1 program exhibited moderate levels of turfgrass quality and were not different from CLEARY, OSU 1, and BASF 1 programs. BASF 2 and BAYER 2 programs resulted in the highest levels of average turfgrass quality and were not significantly different form the BASF 1 program. No symptoms of phytotoxicity were observed." |
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| Language: | English |
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| References: | 0 |
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| Note: | This item is as abstract and tables only!
Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Smith, D. L., and N. R. Walker. 2011. Evaluation of fungicide programs for the management of dollar spot and brown patch of creeping bentgrass, 2010. PDMR: Plant Dis. Manage. Rep. 5:p. T028. |
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| Web URL(s):
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Last checked: 11/14/2016
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Access conditions: Item is within a limited-access website |
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