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| Web URL(s): | http://www.plantmanagementnetwork.org/pub/trial/pdmr/volume3/abstracts/t25.asp
Last checked: 09/21/2009
Notes: Report Summary
https://www.plantmanagementnetwork.org/pub/trial/pdmr/reports/2009/T025.pdf
Last checked: 02/16/2017
Requires: PDF Reader |
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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, Oklahoma |
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| Title: | Evaluation of fungicide programs for the management of dollar spot and brown patch of creeping bentgrass, 2008 |
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| Source: | PDMR: Plant Disease Management Reports. Vol. 3, 2009, p. T025 [1]-T025 [2]. |
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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
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| Cultivar Names: | Penncross |
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| Abstract/Contents: | "Plots were established on a 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. Plots were infested with S. Homoeocarpa by uniformly spreading wheat grains colonized by the fungus over plots on 24 May. Plots were infested with R. solani by placing two fungus-colonized wheat grains in the center of each plot on 28 Jul. All fungicide programs were applied preventatively on a 14-day application interval and were initiated on 24 Apr. Two programs were included from BASF Specialty Products (BASF 1 and BASF 2); two programs were included from Bayer Environmental Science (BAYER 1 and BAYER 2); 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 GPA or 2 gal/1000 sq ft. Ratings of the number of dollar spot foci (rating began 24 Apr), percent of plot with symptoms of brown patch (rating began 10 Jul), and turfgrass quality (scale of 1 - 9 scale where 1 = no turf present, 5 = unacceptable turfgrass, 7 = acceptable turf, 9 = dense, dark color, thick stand of turfgrass; rating began 24 Apr) were taken at 7-day intervals. Dollar spot and brown patch disease data were subjected to the area under the disease progress curve (AUDPC) transformation to account for season-long ratings. These data and turf quality data were analyzed using ANOVA (α = 0.05). Multiple comparisons of means were performed using Fisher's test of protected least significant difference (α = 0.05). Weather conditions early in the evaluation period were abnormally cool, with low humidity, and limited precipitation. Later, weather was hot, very humid, with above average rainfall. Mean final counts (11 Sep) of dollar spot foci were greatest for the non-treated check (80 foci), while lowest counts were recorded in plots sprayed according to programs BASF 1 (0 foci) and BASF 2 (0 foci). Highest levels of brown patch were recorded on 7 Aug with non-treated check plots having the greatest mean disease severity (80%), while lowest levels of mean disease severity were recorded for plots sprayed according to programs BASF 1 (5%) and BASF 2 (5%). Turfgrass quality was significantly lower and ranked unacceptable for non-treated plots compared to all fungicide programs. OSU 1, OSU 2, and OSU 3 programs had significantly higher levels of dollar spot than BAYER 1, BAYER 2, BASF 1, and BASF 2. Plots treated according to programs BAYER 1, BAYER 2, BASF 1, and BASF 2 had the lowest levels of dollar spot and were not significantly different from each other. Levels of brown patch were highest for program OSU 2. Significantly lower levels of brown patch were observed for plots treated according to OSU 1, OSU 3, BAYER 2, and BASF 1 programs. The lowest level of brown patch was recorded in plots treated according to the BASF 2 program. Plots treated with the BAYER 1 program were not significantly different from BASF 1 and BAYER 2 programs.Overall turfgrass quality was highest for plots treated according to programs BASF 1 and BASF 2, followed by the BAYER 1 and BAYER 2 programs. Quality was marginal for OSU 1, OSU 2, and OSU 3 programs." |
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| Language: | English |
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| References: | 0 |
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| Note: | Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Smith, D. L., and N. R. Walker. 2009. Evaluation of fungicide programs for the management of dollar spot and brown patch of creeping bentgrass, 2008. PDMR: Plant Dis. Manage. Rep. 3:p. T025 [1]-T025 [2]. |
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| Web URL(s):
http://www.plantmanagementnetwork.org/pub/trial/pdmr/volume3/abstracts/t25.asp
Last checked: 09/21/2009
Notes: Report Summary
https://www.plantmanagementnetwork.org/pub/trial/pdmr/reports/2009/T025.pdf
Last checked: 02/16/2017
Requires: PDF Reader |
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