Full TGIF Record # 225826
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Publication Type:
Author(s):McDonald, S. J.; Dernoeden, P. H.
Title:Mesotrione for weed control in spring seeded hard fescue
Section:Abstracts and weather data
Other records with the "Abstracts and weather data" Section
Source:2009 Turfgrass Pathology, Weed Science and Management Research Summaries [University of Maryland]. 2009, p. 56.
# of Pages:1
Publishing Information:College Park, Maryland: University of Maryland Department of Plant Science & Landscape Architecture
Related Web URL:http://www.newss.org/proceedings/proceedings_2010.pdf#page=85
    Last checked: 07/26/2013
    Requires: Adobe Acrobat
    Notes: Document is within a single large file; Proceedings: 64th Annual Meeting of the Northeastern Weed Science Society reprint
Keywords:TIC Keywords: Cyperus esculentus; Digitaria ischaemum; Festuca brevipila; Festuca ovina subsp. duriuscula; Glyphosate; Herbicide evaluation; Lespedeza; Mesotrione; Microstegium vimineum; Postemergence weed control; Quinclorac; Seedlings; Sulfentrazone; Tank mix; Weed control
Cultivar Names:Aurora Gold
Abstract/Contents:"Field trials were conducted in Maryland (MD) and Pennsylvania (PA) to better identify the potential level and spectrum of weed control provided by mesotrione in spring seeded 'Aurora Gold' hard fescue (Fesctuca brevipilia, HF). An important objective was to determine if mesotrione applied to the seedbed would affect HF seedling emergence and/or seedling development. Prior to imposing treatments, both sites were treated with glyphosate, tilled and seeded with HF. The HF was seeded on 9 April at the MD site and on 25 April 2009 at the PA site. Mesotrione was applied once prior to both HF and weed emergence (preemergence= PRE) and a second postemergence (POST) application was made. Mesotrione rates were 0.5 lb ai/A applied once PRE and twice at 0.125 lb ai/A, 0.156 lb ai/A, 0.187 lb ai/A, and 0.25 lb ai/A (i.e., PRE and POST). The PRE treatments were applied on 13 and 28 April in MD and PA, respectively and the POST treatments were applied on 19 May 2009 at both sites. Three additional herbicide treatments were included in MD as follows: late postemergence treatments (LATE) of sulfentrazone (0.125 lb ai/A), quinclorac (0.5 lb ai/A) and a tank- mix of sulfentrazone and quinclorac (same rates). In PA, sulfentrazone-alone and the tank mixture were applied, but not quinclorac-alone. The LATE treatments were applied on 10 and 14 June 2009 in MD and PA, respectively. In both locations, plots were mowed to a height of 3 inches every 7 to 10 days throughout the summer months. Herbicides were applied using CO2 powered backpack sprayers in 50 GPA. Plots were arranged in randomized complete blocks with four replications and data were subjected to the analysis of variance. At both sites, plots were assessed for percent weed cover and HF cover. Smooth crabgrass (Digitaria ischaemum), annual Lespedeza (Lespedeza striata) and yellow nutsedge (Cyperus esculentus; YNS) were the predominant weed species in MD. All mesotrione rates applied PRE and POST were effective in controlling smooth crabgrass, Lespedeza, and YNS. Some YNS did re-invade sequentially-treated mesotrione plots in late summer, but not crabgrass or Lespedeza. The sulfentrazone and quinclorac LATE treatments were effective in controlling crabgrass and YNS, but these weeds eventually recovered and/or re-invaded these plots. By late summer, all mesotrione-treated plots, except mesotrione applied once at PRE at 0.5 lb ai/A (4%), had significantly higher HF cover ratings (20-35%) compared to untreated plots (< 1%). Japanese stiltgrass (Microstegium vimineum; JSG) was the major weed species in the PA site. None of the mesotrione treatments effectively controlled JSG. The sulfentrazone and quinclorac LATE treatments, however, reduced JSG cover compared to the control, which helped to increase the HF cover in those plots by late summer, when compared to untreated and mesotrione-treated plots. Following death of the JSG in autumn, most mesotrione-treated as well as untreated plots averaged 80% HF cover. Plots treated with mesotrione at 0.5 lb ai/A PRE and the LATE sulfentrazone and quinclorac treatments, however, had reduced HF cover ratings (60%) compared to the control. Mesotrione applied twice at rates below 0.25 lb ai/A in the PRE and POST timings had the highest HF cover ratings at the end of the study at both locations. The lower HF cover ratings in MD were attributed to heavy and frequent rain that inundated the study area for extended periods throughout spring and early summer, which killed many HF seedlings."
Note:Reprint appears in Proceedings: 64th Annual Meeting of the Northeastern Weed Science Society, Vol. 64 2010, p. 69
This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
McDonald, S. J., and P. H. Dernoeden. 2009. Mesotrione for weed control in spring seeded hard fescue. Turfgrass Pathol. Weed Sci. Res. Sum. p. 56.
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