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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Montgomery, D. P.;
Martin, D. L.;
Cargill, L. M.;
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: | Johnsongrass control with imazameth and glyphosate combinations |
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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. 129. |
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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 study was initiated in May 1995 to evaluate the efficacy of selected herbicide combinations for control of perennial johnsongrass (Sorghum halapense) and tolerance of common bermudagrass (Cynodon dactylon). Herbicide treatments evaluated included Plateau (imazameth) at 0.094, 0.125, 0.156, and 0.188 lb. ai./A, alone, and combined with Roundup (glyphosate) at 0.38 lb. ai./A. Also included were treatments of Plateau at 0.156 lb. ai./A and Plateau (0.156) plus Roundup at 0.38 lb. ai./A combined with a methylated seed oil (MSO) at 0.9% V/V. A standard treatment of Oust (sulfometuron) at 0.094 lb. ai./A plus Roundup at 0.5 lb. ai./A was included. Treatments were applied to actively growing johnsongrass (12-24 inches in height) and common bermudagrass on 22 May. Treatments were applied to 5 ft. by 15 ft. plots using a CO₂ powered bicycle sprayer calibrated to deliver 20 gallons of water per acre. The treatments were arranged in a randomized complete block with threee replications. Visual evaluations were made 1, 2, and 3 months-after-treatment (MAT) for percent control of johnsongrass and bermudagrass injury as compared to the untreated check. All treatments, excluding the lowest three rates of Plateau alone, produced significant bermudagrass injury at 1 MAT. The injury consisted of chlorisis and necrosis of the leaf tips. Injury ranged from 11% to 23% and would be acceptable for roadsides (unacceptable injury > 45%). After a hot, dry mid-summer, injury increased at 2 MAT evaluations for all plots, with even the untreated check showing 43% injury. While all plots were discolored, none were significantly injured more than the check. After timely rains in early August no injury symptoms were observed at 3 MAT evaluations. As experienced in the past, these particular treatments typically produce acceptable injury for 4 to 6 weeks, after which, all injury symptoms are outgrown with rainfall or masked with hot, dry summer conditions. All treatments, excluding the lowest three rates of Plateau alone, produced significant johnsongrass control ranging from 71%-81% at 1 MAT when compared to the untreated check. Due to a wet June, control was 10% to 15% lower than expected. At 2 MAT johnsongrass control increased with all treatments. All treatments, excluding the lowest rate of Plateau alone, produced significant johnsongrass control ranging from 89% to 96% compared to the untreated check at 2 MAT. Johnsongrass control decreased slightly in late summer for most treatments. At 3 MAT treatments of Plateau alone produced 40% to 81% control of johnsongrass which increased to 81% to 96% with the addition of Roundup. The treatments of Plateau + MSO and Plateau and Roundup + MSO produced 85% and 89% johnsongrass control, respectively at 3 MAT. The standard treatment of Oust plus Roundup produced 82%, 94%, and 91% johnsongrass control at 1, 2, and 3 MAT respectively. The data from this study indicate that Plateau alone will not provide acceptable johnsongrass control on bermudagrass roadsides in Oklahoma. The addition of Roundup will increase control to an acceptable level comparable to that of the current standard treatment of Oust 0.094 lb. ai./A and Roundup 0.5 lb. ai./A." |
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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):
Montgomery, D. P., D. L. Martin, L. M. Cargill, and J. H. Baird. 1996. Johnsongrass control with imazameth and glyphosate combinations. South. Weed Sci. Soc. Proc. 49:p. 129. |
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MSU catalog number: SB 611 .S6 |
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