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Spray Adjuvant, Formulation, and Environmental Effects on Synergism from Post-Applied Tank Mixtures of SAN 582H with Fluazifop-P, Imazethapyr, and Sethoxydim

  • Robert C. Scott (a1), David R. Shaw (a1), William B. O'neal (a2) and Troy D. Klingaman (a2)

Abstract

The effect of adding a spray adjuvant to SAN 582H tank mixtures with fluazifop-P, imazethapyr, and sethoxydim was evaluated. SAN 582H synergistically increased broadleaf signalgrass control with reduced rates of all three postemergence (POST) herbicides when no spray adjuvant was used and when crop oil concentrate was added. For example, broadleaf signalgrass control increased from 50% to 83% when SAN 582H was tank-mixed with 52 g ai/ha sethoxydim and crop oil concentrate. In another experiment, several formulations of SAN 582H, including blank solvent-only formulations (no SAN 582H), were evaluated in combination with a reduced rate of sethoxydim to determine the source of synergism from tank mixtures. The SAN 582H molecule, not the carrier solvents in formulated product, was determined to be the source of synergism. The synergistic properties of SAN 582H were compared to other chloroacetamides. Synergism from acetochlor was similar to SAN 582H when applied POST with a reduced rate of either fluazifop-P, imazethapyr, or sethoxydim for grass control. Metolachlor also synergistically increased the control of grasses with the POST herbicides; however, metolachlor caused considerable phytotoxicity when applied alone and synergistic interactions were detected less frequently. The efficacy of sethoxydim mixed with SAN 582H was evaluated under different soil moisture conditions. Broadleaf signalgrass control increased from 81% to 93% under dry, moisture-stressed conditions when 210 g/ha sethoxydim was tank- mixed with SAN 582H.

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Corresponding author

Address correspondence to: David R. Shaw, Mississippi State University, Plant and Soil Sciences Department, Box 9555, Mississippi State, MS 39762, E-mail: dshaw@weedscience.msstate.edu.

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1

Journal article 9152 of the Mississippi Agricultural and Forestry Experiment Station, Mississippi State University.

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References

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Banks, P. A. 1981. Postemergence johnsongrass control in soybeans. Proc. South. Weed Sci. Soc. 34:48.
Boydston, R. A. 1990. Soil water content affects the activity of four herbicides on green foxtail (Setaria viridis). Weed Sci. 38:578582.
Braverman, M. P. 1996. Environment, formulation, and cultural practices influence propanil activity. Proc. South. Weed Sci. Soc. 49:47.
Cantwell, J. R., Liebl, R. A., and Slife, F. W. 1989. Imazethapyr for weed control in soybean (Glycine max). Weed Technol. 3:596601.
Chernicky, J. P., Gossett, B. J., and Murphy, T. R. 1984. Factors influencing control of annual grasses with sethoxydim or RO-13-8895. Weed Sci. 32:174177.
Colby, S. R. 1967. Calculating synergistic and antagonistic responses of herbicide combinations. Weeds 15:2022.
DeFelice, M. S., Brown, W. B., Aldrich, R. J., Sims, B. D., Judy, D. T., and Guethle, D. R. 1989. Weed control in soybeans (Glycine max) with reduced rates of postemergence herbicides. Weed Sci. 37:365374.
Hart, S. E. and Wax, L. M. 1996. Dicamba antagonizes grass weed control with imazethapyr by reducing foliar absorption. Weed Technol. 10:828834.
Hartzler, R. G. and Foy, C. L. 1983. Efficacy of three postemergence grass herbicides for soybeans. Weed Sci. 31:557561.
Kells, J. J., Meggitt, W. F., and Penner, D. 1984. Absorption, translocation, and activity of fluazifop-P-butyl as influenced by plant growth stage and environment. Weed Sci. 32:143149.
Kent, L. M., Wills, G. D., and Shaw, D. R. 1991. Influence of ammonium sulfate, imazapyr, temperature, and relative humidity on the absorption and translocation of imazethapyr. Weed Sci. 39:412416.
Minton, B. W., Kurtz, M. E., and Shaw, D. R. 1989a. Barnyardgrass (Echinochloa crus-galli) control with grass and broadleaf weed herbicide combinations. Weed Sci. 37:223227.
Minton, B. W., Shaw, D. R., and Kurtz, M. E. 1989b. Postemergence grass and broadleaf herbicide interactions for red rice (Oryza sativa) control in soybeans (Glycine max). Weed Technol. 3:329334.
Nalewaja, J. D. and Skrzypezak, G. A. 1986. Absorption and translocation of sethoxydim with additives. Weed Sci. 34:657663.
Retzinger, E. J. Jr., Rodgers, R. L., and Mowers, R. P. 1983. Performance of BAS-9052 applied to johnsongrass (Sorghum halepense) and soybeans (Glycine max). Weed Sci. 31:796800.
Reynolds, D. B., Wheless, T. G., Basler, E., and Murray, D. S. 1988. Moisture stress effects on absorption and translocation of four foliar-applied herbicides. Weed Technol. 2:437441.
Riley, D. G. and Shaw, D. R. 1989. Johnsongrass (Sorghum halepense) and pitted morningglory (Ipomoea lacunosa) control with imazaquin and imazethapyr. Weed Technol. 3:9598.
Scott, R. C., Shaw, D. R., Ratliff, R. L., and Soignier, S. S. 1995. Additive effects of dimethenamid tank mixtures with imazethapyr and sethoxydim. Proc. South. Weed Sci. Soc. 48:85.
Young, B. G., Hart, S. E., and Wax, L. M. 1996. Interactions of sethoxydim and corn (Zea mays) postemergence broadleaf herbicides on three annual grasses. Weed Technol. 10:914922.

Keywords

Spray Adjuvant, Formulation, and Environmental Effects on Synergism from Post-Applied Tank Mixtures of SAN 582H with Fluazifop-P, Imazethapyr, and Sethoxydim

  • Robert C. Scott (a1), David R. Shaw (a1), William B. O'neal (a2) and Troy D. Klingaman (a2)

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