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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.;
Kenna, M. P.;
Cargill, L. M. |
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| Author Affiliation: | Department of Horticulture and Landscape Architecture, Oklahoma State University, Stillwater, OK. |
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| Title: | Sulfosate, Glyphosate and Sulfometuron Combinations for Johnsongrass Control. |
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| Meeting Info.: | Held: January 18-20, 1988, Tulsa, OK. |
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| Source: | Southern Weed Science Society Proceedings. Vol. 41, January 1988, p. 257. |
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| Publishing Information: | Nashville, TN: Southern Weed Science Society. |
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| Keywords: | TIC Keywords: Sulfosate; Glyphosate; Sulfometuron; Sorghum halepense; Control; Cynodon dactylon; Roadside turf; Application rates; Phytotoxicity; Weed control
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| Geographic Terms: | Oklahoma |
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| Abstract/Contents: | "Field experiments on bermudagrass right-of-ways in north central (Location 1) and north eastern (Location 2) Oklahoma were initiated during the spring of 1987 to compare herbicide treatments for control of perennial and seedling johnsongrass. Sulfosate (SC-0224) and glyphosate were tested at rates of 0.5, 0.56, 0.63, 0.69, and 0.75 lb. ai/A combined with sulfometuron at 0.047 and 0.094 lb. ai/A. Experiments were randomized complete block designs with a factorial arrangement of treatments, and replicated three times. Treatments were applied to 5 by 10 ft. plots on 14 May (Location 1) and 3 June (Location 2), with a CO2 powered, hand-held, boom sprayer calibrated to deliver 20 GPA. At application time, bermudagrass was actively growing and the johnsongrass was 12-20 inches tall. Treatments were evaluated on a monthly basis for percent bermudagrass, percent johnsongrass, johnsongrass control and bermudagrass phytotoxicity. Significant variation among locations occurred for all response variables except bermudagrsass phytotoxicity. Johnsongrass control did not vary significantly among products (sulfosate/glyphosate) and sulfometuron rates (0.047 and 0.094 lb. ai/A). Johnsongrass control, one month after treatment (MAT) at Location 1, indicated that product rates of 0.69 lb. ai/A or greater produced the same level of control. At 2 and 3 MAT, product rates of 0.75 lb ai/A produced significantly greater control than all other rates; however, none of the rates produced acceptable johnsongrass control (90% or greater being acceptable). At 1 MAT for Location 2, significant control occurred for product rates of 0.5 lb. ai/A or greater. At 2 and 3 MAT, product rates of 0.63 lb ai/A achieved significantly greater control than other rates and produced an acceptable level of johnsongrass control. At both locations, bermudagrass phytotoxicity did not vary significantly among products (sulfosate/glyphosate), but significantly increased at the higher sulfometuron rate. However, for low maintenance highway right-of-way turf the phytotoxicity was acceptable. Bermudagrass phytotoxicity was not present at later field evaluations. Throughout the year the level of weed control at Location 1 was considerably less than at Loction 2. One possible explanation may be that the soil (adjacent to the highway) at Location 1 was a modified, man-made soil consisting primarily of crushed asphalt and rock. This soil may not have retained the sulfometuron which normally provides the residual control of late germinating johnsongrass seedlings." |
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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., M. P. Kenna, and L. M. Cargill. 1988. Sulfosate, Glyphosate and Sulfometuron Combinations for Johnsongrass Control.. South. Weed Sci. Soc. Proc. 41:p. 257. |
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MSU catalog number: SB 611 .S6 |
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