Full TGIF Record # 224979
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Web URL(s):http://www.ncwss.org/proceed/NCWSS-2012-Proceedings.pdf#page=92
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Author(s):Patton, Aaron J.; Weisenberger, Dan V.; Breeden, Gregory K.; Brosnan, James
Author Affiliation:Patton: Purdue University, W. Lafayette; Weisenberger: Purdue University, Lafayette, IN; Breeden and Brosnan: University of Tennessee, Knoxville, TN
Title:Safety of labeled herbicides for broadleaf weed control in creeping bentgrass putting greens
Other records with the "Foresty/industrial/turf/aqautics/forage/range" Section
Meeting Info.:St. Louis, MO: December 10-13, 2012
Source:67th Annual Meeting of the North Central Weed Science Society. Vol. 67, 2012, p. 92-93.
Publishing Information:Champaign, Illinois: North Central Weed Science Society
# of Pages:2
Keywords:TIC Keywords: 2,4-D + Mecoprop + Dicamba; Agrostis stolonifera; Broadleaf weeds; Carfentrazone-ethyl; Cerastium glomeratum; Dicamba; Euphorbia supina; Herbicides; Mecoprop; Trifolium repens
Trade Names:QuickSilver; Banvel; Trimec Bentgrass; Trimec Classic; Trimec Encore; Mecomec
Abstract/Contents:"While most broadleaf weeds cannot survive at mowing heights used to maintain putting greens, species such as white clover (Trifolium repens), mouse-ear chickweed (Cerastium vulgatum), and prostrate spurge (Euphorbia supina) can persist even with the use of sound management practices. Many golf course superintendents are hesitant to use herbicides on their putting greens for fear that turfgrass injury might occur. The objective of this experiment was to determine the safety of postemergence broadleaf herbicides on putting green height creeping bentgrass (Agrostis stolonifera) turf. The experiment was conducted twice at the W.H. Daniel Turfgrass Research and Diagnostic Center in W. Lafayette, IN and also twice at the East Tennessee Research and Education Center in Knoxville, TN. Sites were creeping bentgrass putting greens grown on a USGA specification sand in IN and in TN the site was a soil-based green frequently topdressed with a USGA specification sand. The locations were mown at 3.5 mm and 4.5 mm in IN and TN, respectively. Plots were treated with herbicide on 24 Oct 2011 and an adjacent location on 22 May 2012 in Indiana and on 17 Oct 2 011 and an adjacent location on 1 May 2012 in TN. Experimental design was randomized complete block with three replications and an individual plot size of 1.5 by 1.5 m in IN and 1.5 by 3.0 m in TN. The herbicides were applied in 814 L ha-1 water at 207 kPa with CO2 pressurized boom sprayer equipped with an XR8002VS flat-fan nozzle at both locations. Herbicides included in this study were all labeled for use on creeping bentgrass putting greens and applied at the putting green label rate and at a rate 2x the label rate. One exception to this was in the Oct 2011 application timing in TN where only the label rate was applied. Herbicide treatments and their labeled putting green rate in liters product per hectare included 4-Speed (2.1 L ha-1) , 4-Speed XT (2.1 L ha-1), Banvel (1.2 L ha-1), Mecomec 2.5 (4.7 L ha-1) , Quicksilver T&O (0.5 L ha-1), Trimec Bentgrass (3.2 L ha-1), Trimec Classic (2.1 L ha-1), Trimec Encore (2.1 L ha-1), and Trimec Southern (2.3 L ha-1). An untreated check was included for comparison. Injury to creeping bentgrass and turf quality data were collected. All data were analyzed using SAS (SAS Institute, Inc). Means were separated using Fishers protected least significant difference when F tests were significant at Ī±=0.05. Some injury was observed from fall treatments on creeping bentgrass putting greens in IN but injury levels were acceptable (>= 7, on a scale of 9-1, where 9=no injury) for all treatments including herbicides applied at a 2x rate. Minor injury occurred from treatments at labeled and 2x rates. The herbicides 4-Speed, 4-Speed XT, Banvel, Trimec Bentgrass, Trimec Encore, and Trimec Southern were among the treatments causing minor injury. In TN, injury was minimal (<7%, on a scale of 0-100% , where 0%= no injury) and transient from labeled application rates with minor injury visible only from Quicksilver, 4-Speed, and 4-Speed XT. There were no differences in turf quality among treatments in Indiana or Tennessee. These results suggest that broadleaf herbicides labeled for putting green use can be safely applied in the fall without fear of causing unacceptable injury. We repeated the experiment in May 2012 to determine if more injury might be expected from late spring and summer applications during warmer temperatures. More injury was observed at both locations from May 2012 applications than Oct 2011 applications. Applications at label rates did not cause unacceptable injury when applied in IN in May, but 2x rates of Banvel, 4-Speed XT, and Trimec Southern did cause unacceptable injury 1 week after application (WAA) that was transient and was acceptable by 2WAA. Results were similar in TN with Banvel, 4-Speed XT, and Trimec Southern applied at the 2x rate also causing the most injury (11-18%) and with injury remaining >10% at 2WAA. In jury was highest at the labeled application rate in TN from Banvel (10%, 2WAA) but other products such as Mecomec, Quicksilver, Trimec Bentgrass, Trimec Classic, and Trimec Encore had <5% injury when applied at the labeled rate in May in TN and these same applications in Indiana also produced little to no injury. These results suggest that 1) broadleaf herbicides labeled for putting green use can be safely applied at labeled rates in the spring, 2) some herbicides are safer than others, and 3) unacceptable injury can occur from spot applications if herbicides are overdosed."
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Patton, A. J., D. V. Weisenberger, G. K. Breeden, and J. Brosnan. 2012. Safety of labeled herbicides for broadleaf weed control in creeping bentgrass putting greens. Proc. North Cent. Weed Sci. Soc. 67:p. 92-93.
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