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Controlling Volunteer Corn (Zea mays) in Soybeans (Glycine max) with Diclofop and Glyphosate

  • Robert N. Andersen (a1), J. Harlan Ford (a2) and William E. Lueschen (a3)

Abstract

We compared diclofop {2-[4-(2,4-dichlorophenoxy)phenoxy] propanoic acid}, as an early over-the-top spray treatment, and glyphosate [N-(phosphonomethyl)glycine], applied twice in repeated applications with a rope-wick applicator, for control of simulated volunteer corn (Zea mays L.) planted in clumps at various intervals in rows of soybeans [Glycine max (L.) Merr.]. Uncontrolled corn at the lowest density (clumps 2.4m apart in the row) reduced soybean yields an average of 31%. Both herbicides were highly effective in controlling corn, but when corn densities were high, diclofop treatments often resulted in greater soybean yields than did glyphosate treatments — presumably because corn interfered with the soybeans for a longer time before glyphosate was applied.

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References

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1. Andersen, R. N. 1976. Control of volunteer corn and giant foxtail in soybeans. Weed Sci. 24:253256.
2. Andersen, R. N. and Geadelmann, J. L. 1979. Varietal influence on control of volunteer corn with diclofop. Agric. Res. Results, Sci. Educ. Admin. U.S. Dep. Agric. ARR-NC-1. 8 pp.
3. Andersen, R. N. and Geadelmann, J. L. 1982. The effect of parentage on the control of volunteer corn (Zea mays) in soybeans (Glycine max . Weed Sci. 30: In press.
4. Dale, J. E. 1979. A non-mechanical system of herbicide application with a rope wick. PANS 25:431436.
5. Fawcett, R. S. and Becker, R. L. 1979. Volunteer corn control with recirculating sprayers and rope wick applicators. North Cent. Weed Control Conf. Res. Rep. 36:302303.

Keywords

Controlling Volunteer Corn (Zea mays) in Soybeans (Glycine max) with Diclofop and Glyphosate

  • Robert N. Andersen (a1), J. Harlan Ford (a2) and William E. Lueschen (a3)

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