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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Flint, J. L.;
Barret, M.;
Olson, G. L. |
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| Author Affiliation: | University of Kentucky |
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| Title: | Effect of 2,4-D or Dicamba on Glyphosate Activity in Johnsongrass. |
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| Source: | Southern Weed Science Society Proceedings. Vol. 40, January 1987, p. 333. |
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| Publishing Information: | Nashville, TN: Southern Weed Science Society. |
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| Keywords: | TIC Keywords: Sorghum halepense; Glyphosate; Dicamba; 2,4-D; Control
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| Abstract/Contents: | "The joint application of glyphosate with 2,4-D or dicamba is a common practice in the control of broadleaf species, however, previous research has shown reduced activity when these mixtures are applied to cetain grass species. In Kentucky, johnsongrass is a perennial grass species often found in association with broadleaf species. The objective of these studies was to characterize the response of johnsongrass to mixtures of glyphosate with 2,4-D or dicamba. A field trial, conducted near Richmond, Kentucky in 1985 was repeated in 1986. Treatments consisted of glyphosate at 0.56, 1.1, and 1.7 kg/ha applied alone and in combination with the dimethylamine salts of 2,4-D or dicamba at 0.28, 0.56, 0.84 or 1.1 kg/ha. Treatments were applied when johnsongrass reached a height of 45 to 55 cm. Visual observations and biomass data were collected 4 weeks after treatment (WAT). Plots were then mowed and evaluated 8 WAT for regrowth. Results in 1986 indicated antagonism of johnsongrass control when glyphosate at 0.28 kg/ha was applied with 2,4-D or dicamba. The antagonism was not observed at the higher glyphosate rates. These results were similar to those obtained in 1985. After verifying field results in greenhouse studies, a second greenhouse study was designed to determine the effect of 2,4-D or dicamba formualtions on the observed antagonism. Treatments contained the following formulations: 2,4-D acid, 2,4-D butoxyethylester, 2,4-D dimethylamine salt, 2,4-D isopropylamine salt (IPA), dicamba dimethylamine salt, and dicamba sodium salt at 0.28 or 0.49 kg/ha mixed with glyphosate at 0.28 kg/ha. Roundup, the commercil formulation of glyphosate, was used in all of the greenhouse experiments. Results indicated antagonism regardless of formulation. Additional treatments of Landmaster, the prepackaged mixture of glyphosate plus 2,4-D IPA, or a mixture of glyphosate at 0.28 kg/ha plus 2,4-D IPA at 0.49 kg/ha plus additional MON 0818 surfactant were also applied. Antagonism was not observed with these mixtures. Laboratory studies indicated that glyphosate uptake was reduced with the addition of 2,4-D or dicamba, and subsequently glyphosate translocation was reduced." |
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| Language: | English |
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| References: | 0 |
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| See Also: | Other items relating to: 2, 4 - D in Turf |
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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):
Flint, J. L., M. Barret, and G. L. Olson. 1987. Effect of 2,4-D or Dicamba on Glyphosate Activity in Johnsongrass.. South. Weed Sci. Soc. Proc. 40:p. 333. |
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MSU catalog number: SB 611 .S6 |
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