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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.;
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 after two years of mowing/herbicide interactions for switchgrass (Panicum virgatum L.) control along roadsides in Oklahoma |
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| Section: | Papers and Abstracts Presented
Other records with the "Papers and Abstracts Presented" Section
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| Meeting Info.: | 49th Annual Meeting, Charlotte, NC, January 15-17, 1996 |
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| Source: | Southern Weed Science Society Proceedings. Vol. 49, 1996, p. 127. |
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| Publishing Information: | Champaign, IL: Southern Weed Science Society. |
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| # of Pages: | 1 |
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| Abstract/Contents: | "A field experiment was initiated in June 1994 and continued in 1995 to evaluate the effects of six herbicide treatments followed by timely mowing cycles for the selective control of switchgrass (Panicum virgatum L.) in bermudagrass (Cynodon dactylon L.) roadsides. Herbicide treatments 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 and June 7, 1995 using a CO₂ powered, bicycle boom sprayer. A carrier rate of 40 GPA was utilized. Mowing treatments consisted of 0, 1 or 2 mowings per year. Mowing at 4 inch height-of-cut with a rotary mower was conducted July 1 and August 22, 1994 and on July 7 and August 24, 1995 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 herbicide phytotoxicity to bermudagrass (1-10 scale). Data presented is for 1995. At 1 month after treatment (MAT), all herbicide treatments caused significant bermudagrass injury. All rates of quizalofop and haloxyfop were significantly more phytotoxic to bermudagrass than the other treatments. No herbicide phytotoxicity was observed on bermudagrass at 2, 3 and 4 MAT. Due to the amount of data generated from this experiment, the following information is based on the 4 MAT evaluations. No significant difference in bermudagrass plot cover was evident due to herbicide treatments. Mowing either 1 or 2 times per year resulted in significantly more bermudagrass coverage compared to no mowing, with no statistical differences present between 1 or 2 mowings. Percent bermudagrass coverage was 37, 51 and 54% for 0, 1 and 2 mowings, respectively, after two years. Switchgrass plot cover was significantly affected by the number of mowings practiced. Mowing two times per year produced significantly less switchgrass coverage than 0 or 1 mowing per year. Mowing one time per year also resulted in significantly less switchgrass coverage than 0 or 1 mowing per year. Mowing one time per year also resulted in significantly less switchgrass coverage as compared to no mowing. Percent switchgrass cover was 19.9, 15.2 and 6.1% for 0, 1 and 2 mowings per year, respectively. Herbicides had a significant effect on switchgrass cover. In plots which received no mowing, the high rate of haloxyfop (0.5 lb.ai./A) resulted in significantly less switchgrass cover than all other treatments except the low rate of haloxyfop (0.25 lb.ai./A). Significantly less switchgrass cover was present in plots mowed one time per year when treated with the high rate of haloxyfop (0.5 lb.ai./A) as compared with all other treatments with the exception of the low rates of haloxyfop (0.25 lb.ai./A) and quizalofop (0.1 lb.ai./A). In plots mowed twice per year, percent switchgrass coverage was significantly higher in plots treated with the low rate of fusilade (0.19 lb.ai./A) or the check (control) when compared to all other treatments. Herbicide control ratings for switchgrass were averaged over mowing treatments to provide a significance ranking of: control < fluazifop (0.19 lb.ai/A) = quizalofop (0.2 lb.ai./A) = fluazifop (0.38 lb.ai./A) = quizalofop (0.1 lb.ai./A) = haloxyfop (0.25 lb.ai./A) = haloxyfop (0.5 lb.ai./A). A significant mowing frequency X herbicide interaction was found. Overall, mowing 1 or 2 times per year provided statistically better control of switchgrass than no mowing." |
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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, D. P. Montgomery, and J. H. Baird. 1996. Effects after two years of mowing/herbicide interactions for switchgrass (Panicum virgatum L.) control along roadsides in Oklahoma. South. Weed Sci. Soc. Proc. 49:p. 127. |
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MSU catalog number: SB 611 .S6 |
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