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Fall and Early Preplant Application Timing Effects on Persistence and Efficacy of Acetamide Herbicides

  • Daniel C. Parker (a1), F. William Simmons (a2) and Loyd M. Wax (a3)


The persistence and efficacy of acetamide herbicides at application timings from fall to preemergence (PRE) were studied in 1998 and 1999 on mollisols (1.1 to 2.8% organic carbon). Metolachlor, s-metolachlor, acetochlor (as an emulsifiable concentrate [EC] formulation and two encapsulated formulations, capsule suspension [CS] and microencapsulated [ME]), and the combination of flufenacet + metribuzin were evaluated at five application times including late fall, 60 and 30 d early preplant (EPP), preplant incorporated, and PRE. Soil bioassays 180 d after application indicated flufenacet + metribuzin, metolachlor, s-metolachlor, and the acetochlor CS had 62 to 74% giant foxtail control, whereas acetochlor EC and ME had 43 to 46% control. Applications at 60 EPP of metolachlor, s-metolachlor, and acetochlor CS provided 70 to 75% giant foxtail control in greenhouse bioassays, whereas flufenacet + metribuzin, acetochlor ME, and acetochlor EC provided 38 to 57% control. At the 30 EPP timing, metolachlor and acetochlor CS had 80 to 82% control, whereas acetochlor EC provided 46% control, and acetochlor ME, flufenacet + metribuzin, and s-metolachlor had 65 to 74% control. Quantitative soil analysis (0 to 6 cm) 10 d after planting (DAP) indicated metolachlor, s-metolachlor, and acetochlor CS concentrations ranged from 12 to 16% and 32 to 47% of applied herbicide for the fall and PRE application timings, respectively, whereas acetochlor (ME and EC) were from 1 to 3% and 16 to 21% of applied for the fall and PRE application timings, respectively. Bioassay reduction was correlated (R 2 = 0.68) with soil-herbicide concentrations at 10 DAP.


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Anderson, W. P. 1996. Weed Science: Principles and Applications. St. Paul, MN: West. 34 p.
Beestman, G. B. and Deming, J. M. 1974. Dissipation of acetanilide herbicides from soils. Agron. J 66:308311.
Bunting, J. A., Simmons, F. W., and Wax, L. M. 2003. Early preplant application timing effects on acetamide efficacy in no-till corn (Zea mays). Weed Technol. 17:291296.
Burnside, O. C. and Schultz, M. E. 1978. Soil persistence of herbicides for corn, sorghum, and soybeans during the year of application. Weed Sci. 26:108115.
Carmer, S. G., Nyquist, W. E., and Walker, W. M. 1989. Least significant differences for combined analysis of experiments with two or three-factor treatment designs. Agron. J 81:665672.
Davis, R. F., Wauchope, R. D., Johnson, A. W., Burgoa, B., and Pepperman, A. B. 1996. Release of fenamiphos, atrazine, and alachlor into flowing water from granules and spray deposits of conventional and controlled-release formulations. J. Agric. Food Chem. 44:29002907.
Doub, J. P., Wilson, H. P., and Hatzios, K. K. 1988. Comparative efficacy of two formulations of alachlor and metolachlor. Weed Sci. 36:221226.
Fleming, G. F., Wax, L. M., and Simmons, F. W. 1992a. Leachability and efficacy of starch-encapsulated atrazine. Weed Technol. 6:297302.
Fleming, G. F., Wax, L. M., Simmons, F. W., and Felsot, A. S. 1992b. Movement of alachlor and metribuzin from controlled release formulations in a sandy soil. Weed Sci. 40:606613.
Gish, T. J., Shirmohammadi, A., Vyravipillai, R., and Wienhold, B. J. 1995. Herbicide leaching under tilled and no-tillage fields. Soil Sci. Soc. Am. J. 59:895901.
Johnson, M. D., Wyse, D. L., and Lueschen, W. E. 1989. The influence of herbicide formulations on weed control in four tillage systems. Weed Sci. 37:239249.
Kotoula-Syka, E., Hatzios, K. K., Berry, D. F., and Wilson, H. P. 1997. Degradation of acetanilide herbicides in history and nonhistory soils from eastern Virginia. Weed Technol. 11:403409.
Mueller, T. C., Shaw, D. R., and Witt, W. W. 1999. Relative dissipation of acetochlor, alachlor, metolachlor, and SAN 582 from three surface soils. Weed Technol. 13:341346.
Petersen, B. B., Shea, P. J., and Wicks, G. A. 1988. Acetanilide activity and dissipation as influenced by formulation and wheat stubble. Weed Sci. 36:243249.
[SAS] Statistical Analysis Systems. 2000. SAS User's Guide. Version 8.1. Cary, NC: Statistical Analysis Systems Institute. Pp. 235237.
Stougaard, R. N., Kapusta, G., and Roskamp, G. 1984. Early preplant herbicide applications for no-till soybean (Glycine max) weed control. Weed Sci. 32:293298.
Vasilakoglou, I. B. and Eleftherohorinos, I. G. 1997. Activity, adsorption, mobility, efficacy, and persistence of alachlor as influenced by formulation. Weed Sci. 45:579585.
Weber, J. B. and Peter, C. J. 1982. Adsorption, bioactivity, and evaluation of soil tests for alachlor, acetochlor, and metolachlor. Weed Sci. 30:1420.
[WSSA] Weed Science Society of America. 1994. Herbicide Handbook of the WSSA. 7th ed. Champaigne, IL: WSSA. Pp. 35, 9–12, 41–45, 103– 105, 197–200, 250–252, and 264–266.
[WSSA] Weed Science Society of America. 1998. Herbicide Handbook of the WSSA. Supplement. 7th ed. Lawrence, KS: WSSA. Pp. 69.
Zimdahl, R. L. and Clark, S. K. 1982. Degradation of three acetanilide herbicides in soil. Weed Sci. 30:545548.


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Fall and Early Preplant Application Timing Effects on Persistence and Efficacy of Acetamide Herbicides

  • Daniel C. Parker (a1), F. William Simmons (a2) and Loyd M. Wax (a3)


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