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| Publication Type:
| Report |
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| Author(s): | Brooks, J. R.;
Baumann, P. A. |
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| Author Affiliation: | Texas Agricultural Extension Service, College Station, TX 77843 |
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| Title: | Virginia buttonweed (Diodia virginian L.) response to postemergence turfgrass herbicides |
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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. 92-93. |
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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: Herbicides; Glyphosate; Imazameth; Postemergence herbicides
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| Abstract/Contents: | "Virginia buttonweed is a diffusely branched perennial weed native to North America that affects the vigor and aesthetics of turfgrasses. It is a very aggressive, spreading type of weed found from New Jersey, west into Illinois and Missouri, south into the Gulf Coast states, and in the eastern third of Texas. Its' decumbent, spreading growth habit make this a very pernicious weed that is not effectively controlled by hand removal or mowing. Therefore, the objective of this study was to evaluate late season applications of several postemergence herbicides for the control of Virginia buttonweed, and to measure phytotoxicity to St. Augustine grass. Individual treatments were arranged in a RCBD and were treated with postemergence applications of herbicides at a church site in Beaumont, Texas and at the Scott's Research Farm in Cleveland, Texas. The herbicides were applied at the Beaumont site on August 30, 1994 to 6.66' x 15' plots. The backpack sprayer utilized was calibrated to deliver 30 gallons per acre of spray solution. At the Cleveland location, the treatments were applied on September 27,1994 to 3.5' x 6' plots with a backpack sprayer calibrated at 62 gallons per acre. Herbicides evaluated at the Beaumont site included: a mixture of triclopyr and clopyralid (Confront), applied at two rates of 0.38 and 0.75 lb. a.i./A; Confront at 0.38 lb. a.i./A plus 2, 4-D at 0.5 lb a.i./A; two treatments with a mixture of MCPA, 2, 4-D, and dicamba (Trimec) at 0.93, 0.5, 0.1 and 1.395, 0.75 and 0.15lb. a.i./A, respectively; metsulfuron (DMC), at 0.019 and 0.039 lb. a.i./A; metsulfuron at 0.019 lb. a.i./A plus imazaquin (Image) at 0.38 lb. a.i./A; metsulfuron at 0.019 lb. a.i./A plus 2, 4-D at 0.5 lb,. a.i./A; and glyphosate (Roundup), at 0.38 lb. a.i./A. At the Cleveland site, all treatments remained the same, with the exception of glyphosate, which was excluded. Imazameth (Cadre), at 0.38 lb. a.i./A and imazethapyr (Pursuit), at 0.38 lb. a.i./A were added to the treatment list at this site. All treatments included X-77 non-ionic surfactant at 0.5% v/v. The treatments containing metsulfuron did not exhibit significant injury at either site, while the treatments containing Confront of Trimec showed slight injury to the turf. The imazethapyr and Cadre (imazameth) treatments at the Cleveland site also exhibited slight injury, while the glyphosate treatment at the Beaumont site showed moderate injury to the St. Augustine grass. All treatments at both locations proved only slightly effective for controlling Virginia buttonweed, with the high rate of Trimec at the Cleveland site providing the greatest efficacy with 23% control. Lack of efficacy in this study could be due to the following circumstances: 1) immediately after the herbicide application, the Beaumont site received .3" of rain, and 2) the Cleveland site was inundated with greater than 24" of rain within a month after application. These factors, coupled with low night-time temperatures and the maturity of the weed at application, may have contributed to the ineffectiveness of the herbicides." |
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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):
Brooks, J. R., and P. A. Baumann. 1995. Virginia buttonweed (Diodia virginian L.) response to postemergence turfgrass herbicides. South. Weed Sci. Soc. Proc. 48:p. 92-93. |
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MSU catalog number: SB 611 .S6 v.48 |
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