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| Web URL(s): | https://www.plantmanagementnetwork.org/pub/trial/fntests/reports/2006/T018.pdf
Last checked: 11/14/2016
Requires: PDF Reader |
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| Publication Type:
| Report |
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| Author(s): | Dernoeden, P. H.;
Fu, J.;
McDonald, S. J. |
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| Author Affiliation: | Department of Natural Resource Sciences and Landscape Architecture, University of Maryland, College Park, Maryland |
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| Title: | Brown patch control in colonial bentgrass with various fungicides, 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. T018. |
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| Publishing Information: | St. Paul, MN: American Phytopathological Society |
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| # of Pages: | 3 |
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| Keywords: | TIC Keywords: Agrostis tenuis; Brown patch; Disease control; Fungicide trials; Application rates; Application timing
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| Abstract/Contents: | "Fungicides were applied with a CO2-pressurized (34 psi) sprayer equipped with a flat-fan nozzle, and calibrated to deliver 1.1 gal water per 1000 sq ft. Treatments were applied on the dates footnoted in the data table. Soil was a Keyport silt loam with a pH of 5.8 and 3.6% OM. The site was seeded in Sep 2004 with SR7150 colonial bentgrass and was fertilized with 3.0 lb N/1000 sq ft in the autumn of 2004. Turf was mowed three times weekly to a height of 0.6-in. Plots were 5 ft x 5 ft, and were arranged in a randomized complete block with four replications. Percent of plot area blighted was assessed visually on a linear 0 to 100% scale where 0 = entire plot area green and healthy, and 100 = entire plot area brown or dead. Treatments with ratings exceeding 5.0% plot area blighted by R. solani were subjectively considered to be unacceptable or at the threshold for retreatment of a golf course fairway. Data were subjected to analysis of variance (ANOVA) and significantly different means were separated according to Fisher's protected least significant difference t-test at P=0.05. Brown patch pressure was low in Jun, became severe in Jul and extremely severe in early Aug. Treatments were applied early curative on 13 Jun. In the week following the initial application there was a weather shift to conditions not conducive to R. solani blighting. Therefore, by 27 Jun there was little or no blighting in the study site. After 5 Jul, brown patch pressure became severe to extremely severe. Between 11 and 25 Jul, there were no significant differences among treatments and most treated plots had zero to a trace level of blighting. At this time, however, plots treated with CL-EXP-4 showed disease levels ranging from 0.5 to 4.5% of plot area blighted, which were below the threshold (i.e., 5%). By 1 Aug (i.e., 18 days since 14-day interval treatments were last applied), brown patch pressure was intense. Plots treated with Eagle + Daconil Ultrex (1.0 + 3.25 oz ; 21-d), Lynx 240 SC (2.0 oz ; 28-d), Iprodione Pro, Cleary's 3336 and 3336 Plus, Cleary's EXP-4 and Spectro were showing loss of residual effectiveness and plots had blight levels ranging from 1.5 to 8.3%. All treatments, except CL-EXP, had blight levels below the threshold at this time. On 8 Aug, plots treated with all CL 3336, CL-EXP-4, Eagle + Daconil Ultrex (28-d), Iprodione Pro, and Spectro had blight levels above the threshold. On the final rating date (15 Aug), plots treated with CL 3336 and CL-EXP-4 fungicides had blight levels equivalent to the untreated control. Lynx-treated plots (45WP; 0.6 oz; 21-d and 240SC; 0.5 fl. oz; 14-d) and Eagle + Daconil Ultrex (0.8 + 1.8 oz ; 14-d) joined those previously mentioned treatments that exceeded the threshold. Good (<5% blighting) to excellent (<2% blighting) brown patch control at this time was provided by Lynx WP (0.3 oz; 14-d); Lynx 240SC (1.0 and 2.0 fl. oz), Insignia (0.9 oz); Headway (0.75 and 1.0 fl. oz); and Endorse. Outstanding control (0% blighting) was provided on all rating dates by Lynx 45WP (1.2 oz; 28-d); Insignia (0.5 oz; 14-d); Heritage TL; and Heritage." |
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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):
Dernoeden, P. H., J. Fu, and S. J. McDonald. 2006. Brown patch control in colonial bentgrass with various fungicides, 2005. F&N Tests. 61:p. T018. |
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| Web URL(s):
https://www.plantmanagementnetwork.org/pub/trial/fntests/reports/2006/T018.pdf
Last checked: 11/14/2016
Requires: PDF Reader |
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MSU catalog number: SB 951.3 .F82 |
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