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Efficacy, Phytotoxicity, and Persistence of Imazaquin, Imazethapyr, and Clomazone in No-Till Double-Crop Soybeans (Glycine max)

  • J. Anthony Mills (a1) and William W. Witt (a1)


Experiments were conducted in 1985 and 1986 to determine and compare the efficacy, phytotoxicity, and soil persistence of imazquin, imazethapyr, and clomazone in no-till double-crop soybeans. All herbicides controlled 93% or greater jimsonweed, velvetleaf, and giant foxtail. Imazaquin and imazethapyr controlled more common cocklebur and ivyleaf morningglory than clomazone. Soybeans were injured from imazaquin and imazethapyr applications in 1986 but yields were not reduced. First-order kinetics described the dissipation of each herbicide. Imazaquin and imazethapyr were more persistent in the soil than clomazone. Averaged over both years, half-lives of 10, 43, and 60 days were calculated for clomazone, imazaquin, and imazethapyr, respectively. Clomazone was not detected 10 to 20 cm in the soil profile. More imazethapyr was detected 10 to 20 cm in the soil profile than imazaquin in 1985. Slight corn injury (≤10%) was observed in 1987 following previous year applications of imazaquin to no-till double-crop soybeans but corn yields were not reduced.



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1. Anonymous. 1988. Command Product Label. FMC Corp., Philadelphia, PA 19103.
2. Anonymous. 1987. Kentucky Agricultural Statistics. U.S. Dep. Agric.
3. Anonymous. 1987. Scepter Product Label. American Cyanamid Co., Wayne, NJ 07470.
4. Anonymous. 1985. Technical Information Report on Pursuit. Agric. Res. Div., American Cyanamid Co., Princeton, NJ 08540.
5. Banks, P. A. and Robinson, E. L. 1982. The influence of straw mulch on the soil reception and persistence of metribuzin. Weed Sci. 30:164168.
6. Banks, P. A. and Robinson, E. L. 1984. The fate of oryzalin applied to straw-mulched and nonmulched soils. Weed Sci. 32: 269272.
7. Banks, P. A. and Robinson, E. L. 1986. Soil reception and activity of acetochlor, alachlor, and metolachlor as affected by wheat (Triticum aestivum) straw and irrigation. Weed Sci. 34: 607611.
8. Basham, G. W., Lavy, T. L., Oliver, L. R., and Scott, H. D. 1987. Imazaquin persistence and mobility in three Arkansas soils. Weed Sci. 35:576582.
9. Camper, H. M., Genter, C. F., and Loope, K. E. 1972. Double cropping following winter barley harvest in eastern Virginia. Agron. J. 64:13.
10. Gunsolus, J. L., Behrens, R., Lueschen, W. E., Warnes, D. D., and Wiersma, J. V. 1986. Carryover potential of AC-263,499, DPX-F6025, FMC-57020 and imazaquin in Minnesota. Proc. North Cent. Weed Control Conf. 41:52.
11. Kapusta, G. 1979. Seedbed tillage and herbicide influence on soybean (Glycine max) weed control and yield. Weed Sci. 27: 520526.
12. Liebl, R. A. and Worsham, A. D. 1983. Tillage and mulch effects on morningglory (Ipomoea spp.) and certain other weed species. Proc. South. Weed Sci. Soc. 36:405414.
13. Little, T. M. and Hills, F. J. 1978. Trend comparisons. Pages 7074 in John Wiley and Sons, eds. Agricultural Experimentation: Design and Analysis. John Wiley and Sons, New York.
14. Lux, J. F. and Dekker, J. 1986. Varietal response of maize to FMC-57020 soil residues. Proc. North Cent. Weed Control Conf. 41:9192.
15. Ohman, M. J. and Arnold, W. E. 1986. The efficacy of FMC 57020 and metribuzin in tank-mix combinations. Proc. North Cent. Weed Control Conf. 41:51.
16. Renner, K. A., Meggitt, W. F., and Leavitt, R. A. 1988. Influence of rate, method of application, and tillage on imazaquin persistence in soil. Weed Sci. 36:9095.
17. Renner, K. A., Meggitt, W. F., and Penner, D. 1988. Effect of soil pH on imazaquin and imazethapyr adsorption to soil and phytotoxicity to corn (Zea mays). Weed Sci. 36:7883.
18. Reynolds, D. B., Westerman, R. B., and Murray, D. S. 1985. Rotational crop response to DPX-F6025, dimethazone, and imazaquin following their application to soybeans. Proc. North Cent. Weed Control Conf. 40:68.
19. Sanford, J. O., Myhre, D. L., and Merwine, N. C. 1973. Doublecropping systems involving no-tillage and conventional tillage. Agron. J. 65:978982.
20. Schroeder, J. and Banks, P. A. 1986. Persistence and activity of norflurazon and fluridone in five Georgia soils under controlled conditions. Weed Sci. 34:599606.
21. Stuckey, D. J. 1976. Effect of planting depth, temperature, and cultivars on emergence and yield of double cropped soybeans. Agron. J. 68:291294.
22. Thelan, K. D., Kells, J. J., and Penner, D. 1986. Rotational crop response and volatilization with FMC-57020. Proc. North Cent. Weed Control Conf. 41:48.
23. Triplett, G. B. Jr. 1978. Weed control for doublecrop soybeans planted with the no-tillage method following small grain harvest. Agron. J. 70:577581.
24. Worsham, A. D. 1974. Influence of no-tillage planters on tolerance of soybeans to linuron. Weed Sci. 22:340344.


Efficacy, Phytotoxicity, and Persistence of Imazaquin, Imazethapyr, and Clomazone in No-Till Double-Crop Soybeans (Glycine max)

  • J. Anthony Mills (a1) and William W. Witt (a1)


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