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| Web URL(s): | http://www.swss.ws/wp-content/uploads/docs/2005 Proceedings-SWSS.pdf#page=279
Last checked: 07/18/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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| Publication Type:
| Report |
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| Author(s): | McElroy, J. S.;
Breeden, G. K. |
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| Author Affiliation: | University of Tennessee, Knoxville, TN |
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| Title: | Tall fescue (Festuca arundinacea) utility turf management with Journey and Plateau |
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| Section: | Vegetation management - rights-of-ways
Other records with the "Vegetation management - rights-of-ways" Section
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| Meeting Info.: | Charlotte, North Carolina: January 24-26, 2005 |
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| Source: | Proceedings of the 58th Annual Meeting of the Southern Weed Science Society. Vol. 58, 2005, p. 200. |
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| Publishing Information: | Champaign, Illinois: Southern Weed Science Society |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Festuca arundinacea; Herbicide evaluation; Imazameth; Lolium x hybridum; Rights-of-way; Seedhead inhibition; Weed control
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| Cultivar Names: | Journey |
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| Trade Names: | Plateau |
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| Abstract/Contents: | "Journey is a new herbicide for tall fescue seedhead suppression in utility turfgrass and highway right-of-way areas. Journey is a pre-package mixture of imazapic and glyphosate that was introduced as a replacement of Plateau, a herbicide containing imazapic alone, in the utility turfgrass market. Glyphosate is only contained in minor amounts in Journey and provides little to no weed control at recommended rates for tall fescue seed suppression. The addition of glyphosate to imazapic, albeit at low concentrations compared to glyphosate non-selective herbicide formulations such as Roundup, still leaves end-users hesitant about using the product. Many utility turfgrass managers in Tennessee, such as airports, municipalities, and Department of Transportation officials have voiced concern about potential injury from glyphosate in the Journey product compared to the standard Plateau formulation. Research was conducted in 2004, therefore to evaluate the use of Journey for tall fescue seedhead suppression compared to Plateau. Research was conducted in 2004 at the University of Tennessee, Knoxville Experiment Station- Plant Sciences Unit, Knoxville, TN. The experiment was conducted on a tall fescue pasture area managed as a right-of-way, with approximately four to six yearly mowings and no fertility added over the past 3 years. Soil was an Etowah silt loam with a pH of 5.4. Eight treatments, plus a non-treated check, where included in the experiment. Plateau treatments contained 0.031, 0.047, 0.063, 0.125 lb ae/a of imazapic. Journey treatments contained the same amount of imazapic, with the addition of 0.063, 0.094, 0.125, and 0.250 lb ae/a of glyphosate, respectively. Equivalent Plateau product rates were 2.0, 3.0, 4.0, and 8.0 fl oz/a. Equivalent Journey product rates were 5.3, 8.0, 10.7, and 21.3 fl oz/a. All treatments included 0.25% v/v NIS. The experiment was conducted in a randomized complete block design with four replicates. Ratings of tall fescue injury and seedhead number was rated at 2 and 7 weeks after treatment (WAT). Tall fescue injury was rated on a scale of 0 (no visible phytotoxicity) to 100 (complete plant necrosis)%. Seedheads suppression was rated on a similar scale were 0% was equal to similar seedhead number compared to the non-treated and 100% was equal to no observed seedheads in the treated area. Data were subjected to analysis of variance (p = 0.05). Journey and Plateau treatments were plotted with increasing imazapic concentrations and the model equations fit to describe the observed trend. Increasing rates of Journey resulted in a linear increase in tall fescue injury 2 weeks after treatment (WAT). Journey at 21.3 fl oz/a injured tall fescue approximately 28%, while no other Journey treatment exceeded 20% injury. No Plateau treatment exceeded 20% injury 2 WAT. Increasing rates of Journey injured tall fescue exponentially 7 WAT. Journey applied at 21.3 fl oz/a exceeded 80% tall fescue injury, a large increase from approximately 28% injury from a 10.7 fl oz/a application. An equivalent imazapic rate applied as Plateau, however, did not exceed 30% tall fescue injury. Little difference was observed between Journey and Plateau when applied in equivalent amounts of imazapic at 0.031 or 0.047 lb ae/a. These data indicate that the additional glyphosate contained within Journey causes no additional tall fescue phytotoxicity when applied at up to 8 fl oz/a of Journey. However, rates above 8 fl oz/a should not be applied due to the potential injury. All Journey and Plateau treatments reduced tall fescue seedheads 100% compared to the non-treated at both 2 and 7 WAT, indicating the effectiveness of both herbicides for tall fescue seedhead suppression. While further ratings were warranted to assess the longevity of tall fescue seedhead suppression, the emergence of dallisgrass and dallisgrass seedheads around mid-June greatly confounded such a task. In fact, by early July little tall fescue was observed at all in any of the plots as the experiment area was dominated throughout by dallisgrass. By late September/early October, however, the stand was again dominated by tall fescue, with the dallisgrass subsiding in growth. Such a coexistence seems common in tall fescue roadsides of Tennessee and due to this fact, the predominant grass mowed during June, July, and August is dallisgrass, not tall fescue. Further research is needed to assess potential growth and seedhead suppression options for dallisgrass in mixed tall fescue/dallisgrass utility turfgrass stands." |
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| Language: | English |
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| References: | 0 |
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| Note: | "The changing world of weed science"
This item is an abstract only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
McElroy, J. S., and G. K. Breeden. 2005. Tall fescue (Festuca arundinacea) utility turf management with Journey and Plateau. South. Weed Sci. Soc. Proc. 58:p. 200. |
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| Web URL(s):
http://www.swss.ws/wp-content/uploads/docs/2005 Proceedings-SWSS.pdf#page=279
Last checked: 07/18/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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MSU catalog number: b2207931 |
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