Web URL(s): http://www.ncwss.org/proceed/NCWSS-2012-Proceedings.pdf#page=90 Publication Type:
i
Report Author(s): Breeden, Gregory K. ;
Brosnan, James ;
Patton, Aaron J. ;
Weisenberger, Dan V. Author Affiliation: Breeden and Brosnan: University of Tennessee, Knoxville, TN; Patton: Purdue University, W. Lafayette; Weisenberger: Purdue University, Lafayette, IN Title: Annual grassy weed control in cool-season turf with topramezone Section: Foresty/industrial/turf/aqautics/forage/rangeOther 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. 90-91.# of Pages: 2 Publishing Information: Champaign, Illinois: North Central Weed Science Society Keywords: TIC Keywords: Digitaria ischaemum ; Festuca arundinacea ; Herbicide evaluation ; HPPD inhibitors ; Poa pratensis ; Topramezone ; Triclopyr Abstract/Contents: "Topramezone is a new hydroxyphenylpyruvate dioxygenase (HPP D) inhibiting herbicide being evaluated for use in cool-season turfgrass. Data describing cool-season turfgrass tolerance and weed control efficacy with topramezone are limited. Separate trials were conducted in 2012 evaluating the efficacy of topramezone applications for smooth crabgrass (Digitaria ischaemum ) control. The site for each trial was a mature stand of tall fescue (Festuca arundinacea ) maintained as a golf course rough at the East Tennessee Research and Education Center-Plant Sciences Unit (Knoxville, TN) and a mature stand of Kentucky bluegrass (Poa pratensis ) at the William H. Daniel Turfgrass Research and Diagnostic Center (West Lafayette, IN). Plots were 1.5 by 3 m in Tennessee and 1.5 by 1.5 m in Indiana at each location were arranged in a randomized complete block design with three replications. Treatments included the factorial combination of topramezone (12.3 g ha-1 and 24.5 g ha-1 ) and triclopyr (1120 g ha-1 ) applied at three stages of smooth crabgrass growth: 1-3 leaf, 1-3 tiller and 5-7 tiller. An untreated control was included for comparison. All herbicides were applied with a CO2 powered boom sprayer calibrated to deliver 281 L ha-1 utilizing four, flat-fan, 8002 nozzles at 124 kPa, configured to provide a 1.5-m spray swath. Tall fescue injury, smooth crabgrass bleaching, and smooth crabgrass control were evaluated visually utilizing a 0 (e.g., no turf injury, control, or bleaching) to 100% (e.g., complete kill) scale at 1, 2, 4, 6, and 9 weeks after treatment (WAT). At no time durin g these studies was tall fescue injury observed at either location. In Tennessee, applications of topramezone (12.3 g ha-1 and 24.5 g ha-1 ) + triclopyr at the 1-3 leaf stage controlled smooth crabgrass >= 87% 4 WAT. When applied at the 1-3 tiller stage, all topramezone and topramezone + triclopyr treatments controlled smooth crabgrass >= 90% 4 WAT. Topramezone (12.3 and 24.5 g ha-1 ) applied 1-3 tiller bleached crabgrass >= 30% 1 WAT and >= 8% 2 WAT. The addition of triclopyr to topramezone at this timing reduced bleaching to 0% 1 and 2 WAT. Applied at the 5-7 tiller stage, topramezone (24.5 g ha-1 ) and topramezone (24.5 g ha-1 ) + triclopyr controlled smooth crabgrass >= 93% 4 WAT; at 12.3 g ha-1 these treatments controlled smooth crabgrass >= 70%. Both rates of topramezone applied at the 5-7 tiller stage bleached crabgrass >= 36% 1 WAT and >= 20% 2 WAT. However, the addition of triclopyr to topramezone reduced bleaching to <= 5% 1 and 2 WAT. In Indiana, applications of topramezone (12.3 g ha-1 and 24.5 g ha-1 ) + triclopyr at the 1-3 leaf stage controlled smooth crabgrass >= 78% 4 WAT. All treatments applied at the 1-3 and 5-7 tiller stages controlled smooth crabgrass <= 45% 4 WAT. Topramezone (12.3 and 24.5 g ha-1 ) applied at the 1-3 tiller stage bleached smooth crabgrass >= 23% 1 WAT and >= 25% 2 WAT. The addition of triclopyr to topramezone at this timing reduced bleaching to <= 13% 1 and 2 WAT. Bleaching responses at the 5-7 tiller stage were similar. Despite the activity of topramezone and reductions in bleaching observed with applications of topramezone + triclopyr at the 1-3 and 5-7 tiller stages growth, smooth crabgrass control measured <= 75% with all treatments by 9 WAT except topramezone (24.5 g ha-1 ) + triclopyr applied at the 1-3 tiller stage in Tennessee. These responses illustrate that sequential applications of these herbicides will be required for effective postemergence smooth crabgrass control." Language: English References: 0 Note: This item is an abstract only! ASA/CSSA/SSSA Citation (Crop Science -Like - may be incomplete ): Proc. North Cent. Weed Sci. Soc. 67:p. 90-91.Fastlink to access this record outside TGIF: https://tic.msu.edu/tgif/flink?recno=224873 If there are problems with this record, send us feedback about record 224873 . Choices for finding the above item : Web URL(s): http://www.ncwss.org/proceed/NCWSS-2012-Proceedings.pdf#page=90 SB 610 .N6 Find from within TIC: Request through your local library's inter-library loan service (bring or send a copy of this TGIF record)
