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Adjuvants Influenced Saflufenacil Efficacy on Fall-Emerging Weeds

  • Stevan Z. Knezevic (a1), Avishek Datta (a1), Jon Scott (a1) and Leo D. Charvat (a2)


Saflufenacil is a new herbicide being developed for preplant burndown and PRE broadleaf weed control in field crops, including corn, soybean, sorghum, and wheat. Field experiments were conducted in 2006 and 2007 at Concord, in northeast Nebraska, with the objective to describe dose–response curves of saflufenacil applied with several adjuvants for broadleaf weed control. Dose–response curves based on log-logistic model were used to determine the effective dose that provides 90% weed control (ED90) values for six broadleaf weeds (field bindweed, prickly lettuce, henbit, shepherd's-purse, dandelion, and field pennycress). Addition of adjuvants greatly improved efficacy of saflufenacil. For example, the ED90 values for field bindweed control at 28 d after treatment were 71, 20, 11, and 7 g/ha for saflufenacil applied alone, or with nonionic surfactant (NIS), crop oil concentrate (COC), or methylated seed oil (MSO), respectively. MSO was the adjuvant that provided the greatest enhancement of saflufenacil across all species tested. COC was the second-best adjuvant and provided control similar to MSO on many weed species. NIS provided the least enhancement of saflufenacil. These results are very similar to the proposed label dose of saflufenacil for burndown weed control, which will range from 25 to 100 g/ha with MSO or COC. We believe that such a dose would provide excellent burndown control of most broadleaf weed species that emerge in the fall in Nebraska.


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Anonymous 2008. Kixor® herbicide worldwide technical brochure. BASF Publication No. GL-69288. Research Triangle Park, NC: BASF Corporation. 18.
Armel, G. R., Wilson, H. P., Richardson, R. J., and Hines, T. E. 2003. Mesotrione, alachlor, and atrazine for weed control in corn (Zea mays). Weed Technol 17:284290.
Corrigan, K. A. and Harvey, R. G. 2000. Glyphosate with and without residual herbicides in no-till glyphosate-resistant soybean (Glycine max). Weed Technol 14:569577.
Dahlke, B. J., Hayden, T. A., Leif, J. W., and Medlin, C. R. 2001. Fall application of imazaquin, plus glyphosate (premix) for winter annual weed control in soybeans. Proc. North Cent. Weed Sci. Soc 56:93. [Abstract.].
Gonzini, L. C., Hart, S. E., and Wax, L. M. 1999. Herbicide combinations for weed management in glyphosate-resistant soybean (Glycine max). Weed Technol 13:354360.
Hart, S. E., Kells, J. J., and Penner, D. 1992. Influence of adjuvants on the efficacy, absorption, and spray retention of primisulfuron. Weed Technol 6:592598.
Hart, S. E. and Wax, L. M. 1996. Dicamba antagonizes grass weed control with imazethapyr by reducing foliar absorption. Weed Technol 10:828834.
Hasty, R. F., Sprague, C. L., and Hager, A. G. 2004. Weed control with fall and early-preplant herbicide applications in no-till soybean. Weed Technol 18:887892.
Heap, I. M. 2008. International Survey of Herbicide Resistant Weeds. Accessed: August 29, 2008.
Hutchinson, P. J. S., Eberlein, C. V., and Tonks, D. J. 2004. Broadleaf weed control and potato crop safety with postemergence rimsulfuron, metribuzin, and adjuvant combinations. Weed Technol 18:750756.
Jordan, D. L., Vidrine, P. R., Griffin, J. L., and Reynolds, D. B. 1996. Influence of adjuvants on efficacy of clethodim. Weed Technol 10:738743.
Knezevic, S. Z. 2006. Weeds species on the increase in eastern Nebraska. Pages 122131. in. Proceedings of the 2006 Crop Protection Clinics. Lincoln, NE: University of Nebraska.
Knezevic, S. Z. 2007. Herbicide tolerant crops: 10 years later. Maydica 52:245250.
Knezevic, S. Z. and Klein, R. N. 2005. Glyphosate rates and selectivity for control of problem weeds in Roundup-Ready soybean. North Central Weed Sci. Soc. Abstr 60:44. [CD-ROM Computer File.].
Knezevic, S. Z., Sikkema, P. H., Tardif, F., Hamill, A. S., Chandler, K., and Swanton, C. J. 1998. Biologically effective dose and selectivity of RPA 201772 (isoxaflutole) for preemergence weed control in corn (Zea mays). Weed Technol 12:670676.
Knezevic, S. Z., Streibig, J. C., and Ritz, C. 2007. Utilizing R software package for dose–response studies: the concept and data analysis. Weed Technol 21:840848.
Krausz, R. F., Young, B. G., and Matthews, J. L. 2003. Winter annual weed control with fall-applied corn (Zea mays) herbicides. Weed Technol 17:516520.
Lee, A. T. and Witt, W. W. 2001. Persistence and efficacy of fall-applied simazine and atrazine. Proc. North Cent. Weed Sci. Soc 56:50. [Abstract.].
Liebl, R. A., Walter, H., Bowe, S. J., Holt, T. J., and Westberg, D. E. 2008. BAS 800H: a new herbicide for preplant burndown and preemergence dicot weed control. Weed Sci. Soc. Am 48:120. [Abstract.].
Nalewaja, J. D. 1986. Seed oils with herbicides. Meded. Fac. Landbouwwet. Rijksuniv. Gent 51/2a:301310.
Sanyal, D., Bhowmik, P. C., and Reddy, K. N. 2006. Influence of leaf surface micromorphology, wax content, and surfactant on primisulfuron droplet spread on barnyardgrass (Echinochloa crus-galli) and green foxtail (Setaria viridis). Weed Sci 54:627633.
SAS 1999. SAS User's Guide. Version 8.1. Cary, NC: SAS Institute.
Seefeldt, S. S., Jensen, J. E., and Fuerst, E. P. 1995. Log-logistic analysis of herbicide dose–response relationships. Weed Technol 9:218227.
Venkatesh, R., Harrison, S. K., and Riedel, R. M. 2000. Weed hosts of soybean cyst nematode (Heterodera glycines) in Ohio. Weed Technol 14:156160.
Wanamarta, G. and Penner, D. 1989. Foliar penetration of herbicides. Rev. Weed Sci 4:215231.
Wilson, R. G., Miller, S. D., Kniss, A. R., Westra, P., and Stahlman, P. W. 2006. Risk of weed spectrum shifts and herbicide resistance in irrigated Roundup-Ready cropping systems—a western Nebraska perspective after 8 years. North Cent. Weed Sci. Soc. Abstr 60:138. [CD-ROM Computer File.].
Young, B. G. and Hart, S. E. 1998. Optimizing foliar activity of isoxaflutole on giant foxtail (Setaria faberi) with various adjuvants. Weed Sci 46:397402.
Zawierucha, J. E. and Penner, D. 2001. Adjuvant efficacy with quinclorac in canola (Brassica napus) and turf grass. Weed Technol 15:220223.


Adjuvants Influenced Saflufenacil Efficacy on Fall-Emerging Weeds

  • Stevan Z. Knezevic (a1), Avishek Datta (a1), Jon Scott (a1) and Leo D. Charvat (a2)


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