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| Web URL(s): | http://www.newss.org/proceedings/proceedings_1997_vol51.pdf#page=115
Last checked: 07/24/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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| Publication Type:
| Report |
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| Author(s): | Kuhns, Larry J.;
Harpster, Tracey L. |
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| Author Affiliation: | Prof. of Ornamental Horticulture and Research Associate, Dept. of Horticulture, The Pennsylvania State University |
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| Title: | Controlling roadside vegetation with thiazopyr, oxyfluorfen, glufosinate, and glyphosate |
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| Meeting Info.: | Newport, RI; January 6-9, 1997 |
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| Source: | Proceedings of the 51st Annual Meeting of the Northeastern Weed Science Society. Vol. 51, 1997, p. 115-117. |
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| Publishing Information: | College Park, MD: Northeastern Weed Science Society |
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| # of Pages: | 3 |
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| Keywords: | TIC Keywords: Glufosinate; Glyphosate; Herbicide efficacy; Herbicide evaluation; Oxyfluorfen; Roadside turf; Weed control
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| Abstract/Contents: | "Introduction: Vegetation must be controlled under guiderails to allow water to flow uniformly away from the road surface and to allow their clear visibility to drivers. The objective of this study was to evaluate the residual activity of two preemergence herbicides, oxyfluorfen and thiazopyr, in the roadside environment. They were used in combination with one of two postemergence herbicides, glufosinate or glyphosate₂], to eliminate existing weeds in the treated areas. Methods: The preemergence treatments evaluated were thiazopyr alone at 0.5, 1.0 and 2.0 lb/a; the same treatments plus oxyfluorfen at 1.6 lb/a; oxyfluorfen alone at 1.6 lb/a; and oryzalin plus oxyfluorfen at 4 and 1.6 lb/a, respectively. The postemergence treatments, or applications of either glyphosate at 2 lb/a or glufosinate at 2 lb/a 11 days prior to the application of the preemergence treatments. Table 1 includes a summary of the treatments. Treatments were applied to 75 ft₂] plots with a CO₂ pressurized test plot sprayer at 30 psi through two 8004E nozzles mounted in a double swivel nozzle body to eliminate the shadow effect around support posts; in 38 GPA. The combination of preemergence herbicides and glyphosate or glufosinate alone were made. On July 8, the preemergence treatments were applied over the areas previously treated with glyphosate or glufosinate. Treatments were applied in a randomized complete block design, with three replications. The study was conducted along a roadside under guiderails in two areas about 400 yards apart. Two replications of the treatments including glyphoate were in one area, and the other replication plus all three replications with glufosinate were in the other. The predominant weeds in the glyphosate areas at the time of application were common ragweed (Ambrosia artemisiifolia L.), birdsfoot trefoil (Lotus corniculatus L.), wild carrot (Daucus carota L.), and crownvetch (Coronilla varia L.). Other weeds distributed throughout were wild buckwheat (Polygonum convolvulus L.), common speedwell (Veronica officinalis L.), bull thistle (Cirsium vulgare (Savi) Tenore.), common burdock (Arctium minus (Hill) Bernh.), goldenrod (Solidago spp), green foxtail (Setaria viridis (L.) Beauv.), red fescue (Festuca rubra L.), and garlic mustard (Alliaria petiolata (Bieb.) Cavara & Grande). Ragweed was 6 to 12 inces tall, all others were 3 to 6 inches tall. The predominant weeds in the glufosinate treated area were wild carrot, common ragweed, spotted knapweed (Centaurea maculosa Lam.), birdsfoot trefoil, and yellow foxtail (Setaria lutescens (Weigel) Hubb.). The weed density and size in this area was lower than in the area treated with glyphosate. The percent green cover in each plot was rated on July 22, August 22, and October 24, 1996. Results and Discussion: Glufosinate provided rapid burndown of all of the weeds in the treated areas (Table 1). There was little regrowth in these areas, even where glufosinate alone was used. There was apparently some herbicide residue in this area from prior applications by the Pennsylvania Department of Transportation. No conclusions can be reached on the effectiveness of the preemergence herbicides used in this part of the study. Initially, all of the treatments including glyphosate provided good to excellent control of all weeds. However, by August 22 it appeared that applying glyphosate prior to the treatments containing oxyfluorfen resulted in better control than applying glyphosate and oxyfluorfen together. The rating on October 24 confirmed this. The oxyfluorfen must injure the weed foliage before the glyphosate can be absorbed and translocated. Perennial weeds were burned down by the combination, but were able to regrow if the oxyfluorfen interrfered with the activity of the gylphosate. In this study, adding thiazoplpyr to the oxyfluorfen did not consistently improve the level of preemergence weed control obtained. In the area to which glyphosate was applied prior to treatment, oxyfluorfen alone or in combination with thiazopyr provided better control than the glyphosate alone. The control provided by thiazopyr at 0.5 lb/a alone provided a level of control between glyphosate alone and the treatments including oxyfluorfen. The roadside environment is extremely variable. Soils are mixed, gravel and grit are added in variable amounts, and highly active, long residual herbicides are periodically added. In addition, a wide mixture of annual and perennial weeds may be present. Several years of testing on a variety of sites is necessary to determine the suitability of a herbicide for use along roadsides." |
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| Language: | English |
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| References: | 0 |
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| Note: | Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Kuhns, L. J., and T. L. Harpster. 1997. Controlling roadside vegetation with thiazopyr, oxyfluorfen, glufosinate, and glyphosate. Proc. Annu. Meet. Northeast. Weed Sci. Soc. 51:p. 115-117. |
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| Web URL(s):
http://www.newss.org/proceedings/proceedings_1997_vol51.pdf#page=115
Last checked: 07/24/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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MSU catalog number: SB 610 .N62 v. 51 |
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