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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Cummings, D. C.;
Stritzke, J. F.;
Nelson, J. A. |
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| Author Affiliation: | Department of Plant and Soil Sciences, Oklahoma State University, Stillwater, OK; and Dow Agrosciences, Cedar Park, TX |
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| Title: | Fluroxypyr alone and in mixtures with other herbicides for the control of sericea lespedeza (Lespedeza cuneata) in grasslands |
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| Section: | Section II: Weed management in turf, pasture, and rangeland
Other records with the "Section II: Weed management in turf, pasture, and rangeland" Section
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| Meeting Info.: | 54th Annual Meeting, Biloxi, Mississippi: January 22-24, 2001 |
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| Source: | Southern Weed Science Society Proceedings. Vol. 54, 2001, p. 61-62. |
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| Publishing Information: | Champaign, IL: Southern Weed Science Society. |
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| # of Pages: | 2 |
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| Keywords: | TIC Keywords: Fluroxypyr; Lespedeza cuneata; Grasslands; Weed control; Triclopyr; Application timing; Application rates; Picloram; Herbicide evaluation; Comparisons; Herbicide combinations
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| Abstract/Contents: | "Sericea lespedeza (Lespedeza cuneata) is an allelopathic, long-lived perennial legume introduced into the southeastern U.S. for erosion control. Due to its aggressive population dynamics, sericea is now considered a weed and can become the dominant grassland species if not managed properly. Altom and Stritzke (1989) and Fick (1990) reported that triclopyr resulted in greater than 90% control on sericea, while control with picloram, dicamba, and 2,4-D was less than 50%. In addition, Altom and Stritzke (1990) reported greater than 95% sericea stem reduction with fluroxypyr at 0.5 lb ae/A, 1 year after treatment (YAT). The objectives of this research were: 1) to compare sericea lespedeza control with fluroxypyr and triclopyr at three application timings, and 2) to evaluate sericea control by fluroxypyr alone and in combination with other herbicides. All herbicide applications were made with a pressurized CO2 backpack sprayer, 20 gallons per acre spray volume. All herbicide treatments had 0.25% v/v non-ionic surfactant added to the spray mixture. In 1995, two experiments were established in central Oklahoma on bermudagrass pasture to compare sericea control with triclopyr (0.5 and 0.75 lb ae/A) and fluroxypyr (0.188 and 0.5 lb ae/A) at three application timings. Herbicides were applied in June, July, and September. All herbicide treatments significantly reduced (P<0.05) established stems of sericea compared to the untreated check 4 YAT. Both rates of triclopyr and fluroxypyr provided good control 4 YAT when applied in June or July (<0.2 stems/ft2 remaining when treated with herbicide vs. 1.1 stems/ft2 in the untreated). September applications were generally not as effective as June and July applications. A third experiment was established in central Oklahoma in 1998, on bermudagrass pasture to evaluate rate responses of herbicides applied in June. Herbicide treatments included: triclopyr (0.25, 0.5 and 0.75 lb ae/A), fluroxypyr (0.09, 0.188, 0.28 lb ae/A) and a 1:1 mixture of picloram + fluroxypyr (0.17, 0.25 and 0.33 lb total ae/A). Established stems of sericea were significantly reduced by all herbicide treatments at 1 and 2 YAT. There were no significant differences in sericea stem densities among herbicide treatments 1 YAT. However, by 2 YAT there were significantly more (P<0.05) sericea stems in the low rates of fluroxypyr alone and in a mixture with picloram, than in the other seven herbicide treatments. With these seven herbicide treatments, stem densities of established plants were less than 3.3 stems/ft2 compared to 7.8 in the untreated check. A fourth experiment was established in north central Oklahoma in 1999, on a tallgrass prairie site to compare first year sericea lespedeza brownout and stem reduction 1 YAT. Herbicide treatments included: triclopyr (0.5 lb ae/A), triclopyr + fluroxypyr (amine) in a 3:1 ratio (0.36 and 0.5 lb ae/A), fluroxypyr alone (0.188 and 0.28 lb ae/A) and triclopyr + fluroxypyr (ester) in a 3:1 ratio (0.34 lb ae/A). Sericea lespedeza control (brownout) 1 month after treatment (MAT) was greater than 90% with all treatments except the triclopyr + fluroxypyr (amine) at 0.36 lb ae/A (only 72% control). One YAT there was a significant reduction (P<0.05) of established sericea with the herbicide treatments (<1.2 stems/ft2 with the herbicide treatments compared to 28 stems/ft2 in the no herbicide check). There were no significant differences in sericea stem densities among herbicide treatments 1 YAT. Sericea forage production 1 YAT was significantly reduced by all herbicide treatments. Less than 400 lb/A of sericea forage was produced in the herbicide treated plots compared to 3500 lb sericea/A in the unsprayed check. Native tallgrass forage production was decreased by >2000 lb/A in the no herbicide treatment, due to the abundance of sericea. In these experiments, fluroxypyr was approximately three times more active on sericea lespedeza than triclopyr. Fluroxypyr at 0.188 lb ae/A controlled sericea 2 YAT as consistently as triclpyr at 0.5 lb ae/A. In addition, pre-mixes of triclopyr or picloram, with fluroxypyr did not enhance the sericea control in the year of application or in the following years, but did provide similar suppression at lower fluroxypyr rates up to 1 YAT." |
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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):
Cummings, D. C., J. F. Stritzke, and J. A. Nelson. 2001. Fluroxypyr alone and in mixtures with other herbicides for the control of sericea lespedeza (Lespedeza cuneata) in grasslands. South. Weed Sci. Soc. Proc. 54:p. 61-62. |
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