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| Web URL(s): | http://www.swss.ws/wp-content/uploads/docs/2012 Proceedings-SWSS.pdf#page=259
Last checked: 08/07/2013
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Notes: Item is within a single large file |
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| Publication Type:
| Report |
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| Author(s): | Evans, C. C.;
Montgomery, D.;
Martin, D. |
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| Author Affiliation: | Oklahoma State University, Stillwater, OK |
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| Title: | Evaluation of post-emergence aminocyclopyrachlor blend combinations for weed control efficacy and bermudagrass tolerance on Oklahoma roadsides |
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| Section: | Vegetation management in utilities, railroads & highways rights-of-way; industrial sites
Other records with the "Vegetation management in utilities, railroads & highways rights-of-way; industrial sites" Section
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| Meeting Info.: | Charleston, South Carolina: January 23-25, 2012 |
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| Source: | 2012 Proceedings, Southern Weed Science Society. Vol. 65, 2012, p. 187. |
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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: Aminocyclopyrachlor; Cynodon dactylon; Herbicide efficacy; Herbicide evaluation; Herbicide injury; Postemergence herbicides; Weed control
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| Geographic Terms: | Oklahoma |
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| Abstract/Contents: | "Research was conducted on US-81, north of Pond Creek, Oklahoma in 2011 to evaluate the effectiveness of 11 herbicide treatments for weed control. .Research continues on aminocyclopyrachlor (DPX-MAT28) for possible use on highway systems. The objectives of this trial were to evaluate treatments for their effectiveness in controlling Palmer amaranth (Amaranthus palmeri), johnsongrass (Sorghum halepense) and large crabgrass (Digitaria sanguinalis) and to assess phytotoxicity on common bermudagrass (Cynodon dactylon). Treatment date was 7 June, 2011 using a CO2-pressurized sprayer delivering 30 gallons of water/A. Treatments were arranged in a randomized complete block design with three replications. Treatments were DPX-MAT28 (2.14 oz/A) + Telar XP (chlorsulfuron) at 0.57 oz/A, DPX-MAT28 (2.98 oz/A) + Telar XP (chlorsulfuron) at 0.79 oz/A, DPX-MAT28 (3.76 oz/A) + Telar XP at 1.0 oz/A, DPX-MAT28 (2.14 oz/A) + Escort XP (metsulfuron) at 0.58 oz/A, DPX-MAT28 (2.98 oz/A) + Escort XP at 0.78 oz/A, DPX-MAT28 (3.76 oz/A) + Escort XP at 1.0 oz/A, DPX-MAT28 (2.5 oz/A) + Oust XP (metsulfuron) 1.0 oz/A + Telar XP 0.5 oz/A + glyphosate (Roundup Pro Concentrate) 9.0 oz/A, DPX-MAT28 2.0 oz/A + Matrix (rimsulfuron) 2.0 oz/A, DPX-MAT28 3.0 oz/A + Matrix 3.0 oz/A, DPX-MAT28 4.0 oz/A + Matrix 4.0 oz/A and Milestone VM (aminopyralid) 7.44 oz/A + Escort XP 0.46 oz/A. All treatments included non-ionic surfactant at 0.25 percent V/V. Weed control was visually evaluated at 15, 30, 63, 91, and 121 days-after-application (DAA) comparing treated plots to non-treated checks. Bermudagrass injury ratings were also rated at these intervals. Growth conditions were adequate 30-45 DAA; however by 63 DAA the study site was under severe temperature and drought pressure. At 15 DAA there was little effect from treatments on common bermudagrass. Treatments containing glyphosate produced yellowing or growth suppression (18%) with all other treatments producing between 6-13% phytotoxicity. Palmer amaranth control was best with DPX-MAT28, Oust XP, and Telar XP + glyphosate at 76%. All other treatments were producing low (17-45%) to moderate levels (55-69%). Johnsongrass control ranged from 15-50%. DPX-MAT28 + Oust XP + Telar XP + glyphosate and DPX-MAT28 4.0 oz/A + Matrix 4.0 oz./A exhibited large crabgrass control of 50 and 58%, respectively. All other treatments produced control ranging from 10-28%. At 30 DAA there were little noticeable differences between treated and non-treated plots in terms of common bermudagrass growth and development.. The treatment including glyphosate continued good Palmer amaranth control at 85%. All other treatments ranged from 23-77% control. Treatments including higher rates of DPX-MAT28 combined with Escort XP + Matrix exhibited control levels of 72-77%. Treatments including the low DPX-MAT28 rates produced low control levels (23-47%). All treatments produced johnsongrass suppression in the range of 15-38%. Large crabgrass control was exhibited across all treatment however separation of drought/heat effect versus herbicidal effect was difficult. At 63 DAA the common bermudagrass had succumbed to drought and was near complete brownout (92-95%). Palmer amaranth control remained similar to levels of 30 DAA. Johnsongrass growth suppression had decreased for all treatments with most treatments similar to the untreated checks. By 63 DAA large crabgrass had died and control data was not taken. At 91 DAA common bermudagrass in all plots had made a complete recovery (100% greenup) due to cessation of drought/heat extremes. Some low-level growth suppression was suspected but data collection was not part of this study. At 91 DAA the Palmer amaranth that were not successfully controlled eventually resumed normal growth and seed-head development. The treatment including glyphosate continued acceptable control levels (80% or greater). All other treatments were showing decreased levels of Palmer amaranth control and were not in the acceptable range. No treatment effects were present on johnsongrass at either 91 or 121 DAA evaluations. At 121 DAA there appeared to be very low levels of common bermudagrass growth suppression (5-7%) in all DPX-MAT28 treatments as compared to the untreated checks. Regardless of whether chlorsulfuron, metsulfuron, or rimsulfuron was mixed with DPX-MAT28, common bermudagrass appeared tolerant of these products. Palmer amaranth that had not been killed was continuing to develop and produce seed-heads in all treatments. The treatment including glyphosate produced a final Palmer amaranth control level of 75%. Treatments that included the 2.98 or 3.76 oz/A rate of DPX-MAT28, combined with either Telar XP or Escort XP, produced 57-62% control. The highest rates of the aminocyclopyrachlor combination treatments produced moderate levels (40-75%) of post-emergent Palmer amaranth control and sustained the control throughout the length of the study. This level of control may hold promise for application to Oklahoma highways and use by the Oklahoma Department of Transportation (ODOT)." |
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| Language: | English |
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| References: | 0 |
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| Note: | This item is an abstract only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Evans, C. C., D. Montgomery, and D. Martin. 2012. Evaluation of post-emergence aminocyclopyrachlor blend combinations for weed control efficacy and bermudagrass tolerance on Oklahoma roadsides. South. Weed Sci. Soc. Proc. 65:p. 187. |
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| Web URL(s):
http://www.swss.ws/wp-content/uploads/docs/2012 Proceedings-SWSS.pdf#page=259
Last checked: 08/07/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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