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| Web URL(s): | http://www.swss.ws/wp-content/uploads/docs/2011 Proceedings-SWSS.pdf#page=264
Last checked: 08/06/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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| Publication Type:
| Report |
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| Author(s): | Evans, C. C.;
Montgomery, D. P.;
Martin, D. L. |
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| Author Affiliation: | Oklahoma State University, Stillwater |
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| Title: | Postemergent control of johnsongrass with nicosulfuron and metsulfuron methyl combinations on Oklahoma roadsides |
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| Section: | Vegetation management in utilities, railroads & highway rights of way; industrial sites
Other records with the "Vegetation management in utilities, railroads & highway rights of way; industrial sites" Section
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| Meeting Info.: | San Juan, Puerto Rico: January 24-26, 2011 |
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| Source: | 2011 Proceedings, Southern Weed Science Society. Vol. 64, 2011, p. 156-157. |
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| Publishing Information: | Champaign, Illinois: Southern Weed Science Society |
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| # of Pages: | 2 |
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| Keywords: | TIC Keywords: Glyphosate; Imazameth; Metsulfuron methyl; Nicosulfuron; Sorghum halepense; Sulfometuron; Sulfosulfuron
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| Trade Names: | Outrider; Oust; Plateau; Roundup Pro |
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| Abstract/Contents: | "A research study was conducted during 2010 to evaluate the effectiveness of several herbicide treatments for selective postemergence control of johnsongrass (Sorghum halepense). The treatments were applied to plots on May 25, 2010 when johnsongrass was 8-20 inches tall. This trial received adequate rainfall for the first six weeks, followed by moderate heat and drought stress through the final six weeks of the study. Treatments were applied using a CO2 pressurized sprayer calibrated to deliver 20 gallons of water/A. The experimental design was a randomized complete block with three replications of treatments. Herbicide treatments included three combinations of DPX-V9360 (nicosulfuron) + DPX-T6376 (metsulfuron methyl), at 0.56 oz a.i./A + 0.15 oz a.i./A, 0.84 oz a.i./A + 0.23 oz a.i./A and 1.13 oz a.i./A + 0.3 oz. a.i/A, respectively. Additional treatments included OutriderĀ® (sulfosulfuron) at 0.75 oz a.i./A, Oust XPĀ® (sulfometuron) at 0.75 oz a.i./A and PlateauĀ® (imazapic) at 1.0 oz a.i./A. All herbicides or herbicide combinations were mixed with Roundup Pro ConcentrateĀ® (glyphosate) at 8.13 oz a.i./A with the exception of PlateauĀ® (imazapic) that was combined with Roundup Pro ConcentrateĀ® (glyphosate) at 6.25 oz. a.i./A. Plots were visually evaluated at 13, 30, 59 and 92 days after application (DAA) for percent weed control as compared to untreated plots. While the herbicide treatment vs non-treated control effect was highly statistically significant, there were no statistical differences at the p = 0.10 (90% certainty level) amongst the various herbicide treatments within dates at 13, 30, 59 and 92 DAA. Statistical differences in herbicide treatment effect were present relative to phytotoxicity with p values of 0.08, 0.03 and 0.004 at 13, 30 and 59 DAA. Up to 30% phytotoxicity is acceptable provided recovery occurs within 30-35 DAA. All treatments exhibited acceptable (0-14%) phytotoxicity levels at all rating dates throughout the length of the trial. This study was conducted under good growing conditions including normal rainfall amounts during the first half of the trial and below normal rainfall during the second half of the trial. Temperatures were within normal seasonal ranges throughout the trial. At 13 DAA all herbicide treatments were well below acceptable levels of johnsongrass control (80%). Treatments of sulfosulfuron (0.75 oz a.i./A) and sulfometuron (0.75 oz a.i./A) + glyphosate (8.13 oz a.i./A) resulted in 67 and 79% control respectively. Imazapic at 1.0 oz a.i./A + glyphosate (6.25 oz a.i./A) resulted in 68% control. The lowest rate of nicosulfuron (0.56 oz a.i/A) + metsulfuron methyl (0.15 oz a.i./A) + glyphosate (8.13 oz a.i./A) yielded 75% control. Middle rates of nicosulfuron (0.84 oz a.i/A) + metsulfuron methyl (0.23 oz a.i./A) + glyphosate (8.13 oz a.i./A) yielded 64% control. The highest rates of nicosulfuron (1.13 oz a.i/A) + metsulfuron methyl (0.3 oz a.i./A) + glyphosate (8.13 oz a.i./A) yielded 73% control. At 30 DAA all herbicide treatments were well above acceptable levels of johnsongrass control (80%). Treatments of sulfosulfuron (0.75 oz a.i./A) and sulfometuron (0.75 oz a.i./A) + glyphosate (8.13 oz a.i./A) resulted in 94 and 93% control respectively. Imazapic at 1.0 oz a.i./A + glyphosate (6.25 oz a.i./A) resulted in 93% control. The lowest rate of nicosulfuron (0.56 oz a.i/A) + metsulfuron methyl (0.15 oz a.i./A) + glyphosate (8.13 oz a.i./A) yielded 89% control. Middle rates of nicosulfuron (0.84 oz a.i/A) + metsulfuron methyl (0.23 oz a.i./A) + glyphosate (8.13 oz a.i./A) yielded 89% control. The highest rates of nicosulfuron (1.13 oz a.i/A) + metsulfuron methyl (0.3 oz a.i./A) + glyphosate yielded 90% control. At 59 DAA all herbicide treatments were again well above acceptable levels of johnsongrass control (80%). Treatments of sulfosulfuron (0.75 oz a.i./A) and sulfometuron (0.75 oz a.i./A) + glyphosate (8.13 oz a.i./A) resulted in 97 and 92% control respectively. Imazapic at 1.0 oz a.i./A + glyphosate (6.25 oz a.i./A) resulted in 91% control. The lowest rate of nicosulfuron (0.56 oz a.i/A) + metsulfuron methyl (0.15 oz a.i./A) + glyphosate (8.13 oz a.i./A) yielded 96% control. Middle rates of nicosulfuron (0.84 oz a.i/A) + metsulfuron methyl (0.23 oz a.i./A) + glyphosate (8.13 oz a.i./A) yielded 95% control. The highest rates of nicosulfuron (1.13 oz a.i/A) + metsulfuron methyl (0.3 oz a.i./A) + glyphosate (8.13 oz a.i./A) yielded 89% control. At 92 DAA all herbicide treatments were again well above acceptable levels of johnsongrass control (80%). Treatments of sulfosulfuron (0.75 oz a.i./A) and sulfometuron (0.75 oz a.i./A) + glyphosate (8.13 oz a.i./A) resulted in 96 and 86% control respectively. Imazapic at 1.0 oz a.i./A + glyphosate (8.13 oz a.i./A) resulted in 87% control. The lowest rate of nicosulfuron (0.56 oz a.i/A) + metsulfuron methyl (0.15 oz a.i./A) + glyphosate (8.13 oz a.i./A) yielded 92% control. Middle rates of nicosulfuron (0.84 oz a.i/A) + metsulfuron methyl (0.23 oz a.i./A) + glyphosate (8.13 oz a.i./A) yielded 93% control. The highest rates of nicosulfuron (1.13 oz a.i/A) + metsulfuron methyl (0.3 oz a.i./A) + glyphosate (8.13 oz a.i./A) yielded 90% control. All three combinations of nicosulfuron + metsulfuron methyl + glyphosate are effective at controlling johnsongrass. There were no significant differences between rates indicating nicosulfuron (0.56 oz a.i/A) + metsulfuron methyl (0.15 oz a.i./A) + glyphosate(8.13 oz a.i./A) would likely be the most cost effective treatment combination for Oklahoma roadsides." |
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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. P. Montgomery, and D. L. Martin. 2011. Postemergent control of johnsongrass with nicosulfuron and metsulfuron methyl combinations on Oklahoma roadsides. South. Weed Sci. Soc. Proc. 64:p. 156-157. |
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| Web URL(s):
http://www.swss.ws/wp-content/uploads/docs/2011 Proceedings-SWSS.pdf#page=264
Last checked: 08/06/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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