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Controlling Kochia (Kochia scoparia) in Soybean (Glycine max) with Postemergence Herbicides

  • Gail A. Wicks (a1), Alex R. Martin (a2) and Gordon E. Hanson (a1)


POST herbicides were applied at four soybean growth stages to evaluate their effect on triazine-resistant (TR) kochia in 1991, 1992, and 1993. Applying imazethapyr at 70 g ai/ha or bentazon plus imazethapyr at 1,120 plus 70 g ai/ha controlled 75 to 100% of 1- to 13-cm-tall TR kochia consistently across growth stages and years. Acifluorfen at 560 g ai/ha, chlorimuron at 13 g ai/ha, or chlorimuron plus thifensulfuron at 4 plus 4 g ai/ha controlled 68 to 96% of 1- to 2-cm-tall TR kochia at soybean growth stage VC to V1, and control was inconsistent at later growth stages. In most instances, soybean seed yield was greater with herbicides applied at the V1 or V2 growth stage of soybean compared with the V4 and V5 growth stage because of better weed control. No wheat yield reduction occurred because of herbicide carryover in 1992 and 1994. However, in 1993, imazethapyr and bentazon plus imazethapyr treatments applied in 1992 caused 22% injury and reduced winter wheat yield 10% when wheat was planted after soybean harvest.



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Cantwell, J. R., Liebl, R. A., and Slife, F. W. 1989. Imazethapyr for weed control in soybean (Glycine max). Weed Technol. 3:596601.
Friisoe, G. Y. and Martin, A. R. 1985. Enhancement of bentazon activity with liquid fertilizer. Proc. North Cent. Weed Sci. Soc. 40:98.
Furrer, J. D., Martin, A. R., Roeth, F. W., Moomaw, R. S., Wilson, R. G., Wicks, G. A., and Klein, R. N. 1985. A 1985 Guide for Herbicide Use in Nebraska. Lincoln, NE: Nebraska Cooperative Extension Service Extension Circular 85–130.
Haack, A. E. 1987. Geographic distribution of triazine-resistant kochia [Kochia soparia (L) Schrad.] in Nebraska and response to selected herbicides. M. S. Thesis. University of Nebraska, Lincoln, NE. 64 p.
King, C. A. and Oliver, L. R. 1989. Timing of postemergence imazethapyr (Pursuit) applications. Proc. South. Weed Sci. Soc. 42:58.
King, C. A. and Oliver, L. R. 1992. Application rate and timing of acifluorfen, bentazon, chlorimuron, and imazaquin. Weed Technol. 6:526534.
Klingaman, T. E., King, C. A., and Oliver, L. R. 1992. Effect of application rate, weed species, and weed stage of growth on imazethapyr activity. Weed Sci. 40:227232.
Krausz, R. F., Kapusta, G., and Knake, E. L. 1992. Soybean (Glycine max) and rotational crop tolerance to chlorimuron, clomazone, imazaquin, and imazethapyr. Weed Technol. 6:7780.
Muzyr, K. R., Dobson, J. R., Farlow, F., and Trimmer, M. 1989. Influence of timing and fertilizer solution on postemergence Pursuit® applications in soybeans. Proc. South. Weed Sci. Soc. 42:59.
Ritchie, S. W., Hanway, J. J., and Thompson, J. E. 1982. How a Soybean Plant Develops. Herman, J. C., ed. Iowa State University Cooperative Extension Service. Ames, IA: Special Report No. 53. p. 15.
Walsh, J. D., Defelice, M. S., and Sims, B. D. 1993. Soybean (Glycine max) herbicide carryover to grain and fiber crops. Weed Technol. 7:625632.
Wicks, G. A. 1986. Atrazine resistant kochia. Proceedings of the Crop Protection Clinics. Lincoln, NE: University of Nebraska Cooperative Extension Service. pp. 169171.
Wicks, G. A. and Klein, R. N. 1991. Feasibility of non-irrigated soybean (Glycine max) production in the semi-arid central Great Plains. Weed Technol. 5:369375.
Wicks, G. A., Martin, A. R., and Mahnken, G. W. 1993. Control of triazine-resistant kochia (Kochia scoparia) in conservation tillage corn (Zea mays). Weed Sci. 41:225231.


Controlling Kochia (Kochia scoparia) in Soybean (Glycine max) with Postemergence Herbicides

  • Gail A. Wicks (a1), Alex R. Martin (a2) and Gordon E. Hanson (a1)


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