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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Cargill, L. M.;
Martin, D. L.;
Montgomery, D. P. |
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| Author Affiliation: | Department of Horticulture and Landscape Architecture, Oklahoma State University, Stillwater, Oklahoma |
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| Title: | Evaluation of herbicides for the selective control of switchgrass (Panicum virgatum L.) on Oklahoma highway rights-of-way |
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| Meeting Info.: | Charlotte, NC: January 18-20, 1993 |
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| Source: | Southern Weed Science Society Proceedings. Vol. 46, 1993, p. 231. |
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| Publishing Information: | Champaign, IL: Southern Weed Science Society. |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Panicum virgatum; Roadside turf; Cynodon dactylon; Herbicides
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| Geographic Terms: | Oklahoma |
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| Abstract/Contents: | "In recent years, roadside vegetation management practices by the Oklahoma Department of Transportation have resulted in a subtle, yet significant increase in switchgrass (Panicum virgatum L.) populations along Oklahoma highway rights-of-way. Switchgrass, a tall (1-2m), perennial, warm-season, sod-forming native grass is winter hardy, drought resistant and spreads slowly by seed and short underground stems (rhizomes). During the past few years, it has slowly but steadily invaded areas immediately adjacent to the paved roadside shoulders, creating serious sight distance problems for motorists. A field study was initiated in May 1991 to evaluate the efficacy of eighteen herbicide treatments for the control of switchgrass and their phytotoxicity to bermudagrass. Treatments included sethoxydim at 0.28 and 0.4 lb.ai./A, fluazifop at 0.19 and 0.38 lb.ai./A, clethodim at 0.1 and 0.2 lb.ai./A, asulam at 3.34 and 6.68 lbs.ai./A, haloxyfop at 0.25 and 0.5 lb.ai./A, imazapyr at 0.25 and 0.5 lb.ai./A, quizalofop at 0.1 and 0.2 lb.ai./A, glyphosate at 1.0 and 1.5 lbs.ai./A and sulfometuron at 0.09 and 0.19 lb.ai./A. All treatments except glyphosate were combined with a crop oil at a rate of 0.5% v/v. Treatments were applied to eight feet by twenty feet plots using a CO2 powered, bicycle boom sprayer applying a carrier rate of 40 GPA. The experimental design was a randomized complete block with three replications. All treatments, except the lowest rate of glyphosate caused significant bermudagrass phytotoxicity at 1 month after treatment (MAT). By 2 MAT, the high rate of fluazifop, all treatments of haloxyfop and imazapyr and the highest rate of quizalofop showed significant bermudagrass phytotoxicity. At 3 MAT the only bermudagrass plots exhibiting significant phytotoxicity were those treated with the high rate of haloxyfop and both rates of imazapyr. The phytotoxicity observed in the plots treated with haloxyfop would probably be acceptable for roadside turf, however, the amount of injury observed from both treatments of imazapyr would not be acceptable. With the exception of sulfometuron, all treatments exhibited significant phytotoxicity to switchgrass at 1 MAT. When evaluation were made at 2 MAT the only treatment not causing significant phytotoxicity was the lower rate of sulfometuron. This same trend was observed 3 MAT, with the addition of the lower rate of asulam. The greatest amount of switchgrass phytotoxicity appear to be from the following treatments: the high rate of fluazifop, both rates of haloxyfop and the high rate of quizalofop. Switchgrass height was significantly reduced by all treatments except the low rate of asulam when evaluations were made at 1 and 2 MAT. By 3 MAT, switchgrass heights in the untreated check plots were significantly taller than switchgrass treated with any of the herbicides. The greatest amount of reduction in switchgrass heights occurred with the high rate of fluazifop and all rates of haloxyfop and imazapyr. At 2 MAT, switchgrass seedhead production was significantly reduced by all herbicide treatments except both rates of asulam. This same trend was observed 3 MAT with the addition of the low rate of sulfometuron. The better treatments for reducing switchgrass seedhead formation appear to be the high rate of fluazifop, all rates of haloxyfop, imazapyr and quizalofop." |
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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):
Cargill, L. M., D. L. Martin, and D. P. Montgomery. 1993. Evaluation of herbicides for the selective control of switchgrass (Panicum virgatum L.) on Oklahoma highway rights-of-way. South. Weed Sci. Soc. Proc. 46:p. 231. |
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