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| Publication Type:
| Report |
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| Author(s): | Cargill, L. M.;
Martin, D. L.;
Montgomery, D. P.;
Baird, J. H. |
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| Author Affiliation: | Department of Horticulture and Landscape Architecture, Oklahoma State University, Stillwater OK 74078 |
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| Title: | Effects of mowing/ herbicide interaction for switchgrass (Panicum virgatum L.) control along roadsides in Oklahoma |
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| Meeting Info.: | 48th Annual Meeting, Memphis, TN, January 16-18, 1995 |
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| Source: | Southern Weed Science Society Proceedings. Vol. 48, January 1995, p. 151-152. |
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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: Cynodon dactylon; Herbicides; Panicum virgatum
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| Abstract/Contents: | "A field experiment was initiated in June 1994 to evaluate the efficacy of six herbicide treatments followed by timely mowing cycles for the selective control of switchgrass (Panicum virgatum L.) in bermudagrass roadsides. Herbicide treatments evaluated included fluazifop (Fusilade) at 0.19 and 0.38 lb.ai/A, haloxyfop (Verdict) at 0.25 and 0.5 lb.ai/A and quizalofop (Assure) at 0.1 and 0.2 lb.ai/A. All herbicide treatments were combined with a crop oil at a rate of 0.5% v/v. Herbicide treatments were applied to sixteen-foot by twenty-foot main plots on June 2, 1994 using a ² powered, bicycle boom sprayer. A carrier rate of 40 GPA was utilized. Mowing cycles were initiated on July 1 and August 22, 1994 just as switchgrass seedhead formation began. The experimental design was a randomized complete block with three replications, with a split plot arrangement of treatments split in time. Visual observations were made for bermudagrass phytotoxicity, switchgrass height, percent switchgrass seedhead suppression, percent switchgrass density, percent bermudagrass density and switchgrass control. All herbicide treatments caused significant bermudagrass injury at 1 month after treatment (MAT). By 2 MAT, only the high rates of fluazifop and quizalofop caused bermudagrass phytotoxicity, however, these effects were not statistically significant. No bermudagrass phytotoxicity was observed from any herbicide treatment when evaluations were made at 3 and 4 MAT. Due to the amount of data generated from this experiment, the following information in this abstract is based upon the 4 MAT evaluations. All herbicide treatments resulted in lower switchgrass heights in the unmowed subplots when compared to the untreated check, however, no significant differences among herbicide treaments were observed. No significant differences in switchgrass heights were observed among any of the herbicide subplot treatments which had been mowed either once or twice. Significant switchgrass seedhead suppression occurred with all herbicide treatments in the unmowed subplots wehn compared to the untreated check, however, no significant differences among herbicide treatments were observed. In subplots mowed once, only treatments of the high rate of fluazifop and the low rate of haloxyfop were significantly different from the high rate of haloxyfop for switchgrass seedhead suppression. No significant differences among herbicide treatments were observed in any subplot mowed twice. Percent switchgrass density was significantly reduced by all herbicide treatments. No significant differences among herbicide treatments were observed for percent switchgrass density. Plots treated with the high rate of fluazifop resulted in significantly more bermudagrass than plots treated with the high rate of quizalofop or the untreated check. There were no significant differences among the remainder of the herbicide treatments for percent bermudagrass density. Significant switchgrass control was exhibited by all herbicide treatments in the unmowed subplots. The high rate of fluazifop provided significantly better switchgrass control than both rates of quizalofop in the unmowed subplots. There were no significant differences among the remainder of the herbicide treatments. With the exception of the high rate of haloxyfop, no treatment was significantly different from the untreated check plot when subplots were mowed once. All subplots which were mowed twice (plus the addition of a herbicide treatment) provided significant control of switchgrass. It appears from the data in this experiment when either one or two mowing cycles are combined with a selective herbicide, switchgrass efficacy is not improved when compared to the use of a selective herbicide alone." |
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| Language: | English |
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| References: | 0 |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Cargill, L. M., D. L. Martin, D. P. Montgomery, and J. H. Baird. 1995. Effects of mowing/ herbicide interaction for switchgrass (Panicum virgatum L.) control along roadsides in Oklahoma. South. Weed Sci. Soc. Proc. 48:p. 151-152. |
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