Full TGIF Record # 225220
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Web URL(s):http://www.swss.ws/wp-content/uploads/docs/2005 Proceedings-SWSS.pdf#page=280
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Publication Type:
i
Report
Author(s):Blair, M. P.
Author Affiliation:Department of Agronomy, University of Kentucky, Lexington, KY
Title:Evaluation of turf growth regulators for tall fescue (Festuca arundinacea Schreb.) seedhead suppression
Section:Vegetation management - rights-of-ways
Other records with the "Vegetation management - rights-of-ways" Section
Meeting Info.:Charlotte, North Carolina: January 24-26, 2005
Source:Proceedings of the 58th Annual Meeting of the Southern Weed Science Society. Vol. 58, 2005, p. 201.
Publishing Information:Champaign, Illinois: Southern Weed Science Society
# of Pages:1
Keywords:TIC Keywords: Color; Festuca arundinacea; Growth regulator evaluation; Herbicide efficacy; Seedhead inhibition
Abstract/Contents:"Herbicides marketed specifically for tall fescue seedhead suppression and broadleaf weed herbicides labeled for tall fescue seedhead suppression are commonly used by landowners to reduce mowing frequencies. The Kentucky Transportation Cabinet (KTC) specifically uses these compounds to suppress tall fescue seedheads in areas where it is cost prohibitive to mow. The standard treatment for the KTC is Stronghold at 12 fluid ounces per acre. A study was designed to examine rate titrations and tank mixtures of labeled seedhead suppressants for efficacy in tall fescue seedhead suppression and discoloration to tall fescue foliage. The trial was installed in two locations; one located at Princeton, KY in western Kentucky and one located at Lexington, KY in central Kentucky. A randomized complete block design with three replications (blocks serving as replicates) was installed at each site and 25 treatments were applied at 20 GPA using a CO2 powered sprayer. The Princeton trial was installed on April 5th, 2004 and the Lexington trial was installed on April 27th, 2004. Plots were 7' X 25' and all treatments included a nonionic surfactant at 0.25% v/v. Treatments included Stronghold (a.i. mefluidide, imazethapyr, and imazapyr) at 8, 12, and 16 fl oz / ac, Stronghold at 2, 3, and 4 fl oz / ac with each being tank mixed with Escort (a.i. metsulfuron methyl) at 0.25 and 0.5 oz / ac, Plateau (a.i. imazapic) at 1, 2, 3, and 4 fl oz / ac, Plateau at the same rates with each being tank mixed with Escort at 0.25 and 0.5 oz / ac, Escort alone at 0.25, 0.33, and 0.5 oz / ac, and an untreated control. Color evaluations were made 1, 6, and 12 WAT at both sites using a 0 to 9 scale (0 = severely damaged, 9 = fully green). Color data were analyzed using the GLM procedure in SAS® and treatment means were compared using Fisher's LSD at p = 0.05. Tall fescue seedhead density measurements were made 6, 8, and 10 WAT at Princeton and 4, 6, and 8 WAT at Lexington. Density was estimated using categorical data and analyzed using nonparametric macros in SAS that incorporated the RANK and MIXED procedures. The Princeton site experienced higher degrees of discoloration (means ranged form 3.3 to 7) across all treatments at 6 WAT as compared to the Lexington site (means ranged from 4.5 to 7). This was attributed to the higher precipitation levels at Lexington in the month following application than the Princeton site. The high precipitation at Lexington (5 inches above normal for the month of May) may have ameliorated the effect of the herbicide on tall fescue vegetative growth. A general rate response was observed at both sites as increasing rates increased discoloration. Stronghold at 12 fl oz / ac and Stronghold at 3 fl oz plus Escort at 0.25 oz provided complete inhibition of tall fescue seedhead growth from 6 WAT through 10 WAT at the Princeton site. Plateau alone at 2 and 3 fl oz was also effective in complete inhibition through the same time period at Princeton. Several Plateau plus Escort treatments, 1 fl oz + 0.25 oz, 3 fl oz + 0.25 oz, 4 fl oz + 0.25 oz, and 2 fl oz + 0.5 oz respectively, were effective in complete inhibition at the same time period at Princeton. Only Plateau at 1 fl oz, Plateau at 1 fl oz and 2 fl oz + Escort at 0.25 oz, and Plateau at 2 fl oz + Escort at 0.5 oz provided total suppression at the Lexington site and this occurred 8 WAT. No one treatment of Escort alone was effective in satisfactory seedhead suppression at either site. It is known that timing of application is crucial because seedheads developed before the application of these compounds are not suppressed. The timing of the application at Lexington may have been too late as this site saw limited suppression of seedheads at the same time intervals compared to the Princeton site. Different environmental factors between the two sites such as precipitation amounts also may have influenced the results."
Language:English
References:0
Note:"The changing world of weed science"
This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Blair, M. P. 2005. Evaluation of turf growth regulators for tall fescue (Festuca arundinacea Schreb.) seedhead suppression. South. Weed Sci. Soc. Proc. 58:p. 201.
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http://www.swss.ws/wp-content/uploads/docs/2005 Proceedings-SWSS.pdf#page=280
    Last checked: 07/18/2013
    Requires: PDF Reader
    Notes: Item is within a single large file
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