Broadleaf Weed Control and Crop Safety with Premixed Pyrasulfotole and Bromoxynil in Winter Wheat


For more than two decades acetolactate synthase (ALS) inhibiting herbicides have been the major weed control tools in winter wheat which resulted in selection of resistant weeds to those herbicides. Premix of pyrasulfotole & bromoxynil (Huskie?), a relatively new herbicide, was registered for use in wheat in 2008. Pyrasulfotole inhibits 4-hydoxyphenylpyruvate dioxygenase (HPPD) enzyme in susceptible plants and is the first significant new mode of action for use in cereals for more than two decades. Field experiments were conducted from 2007 to 2010 at two locations in Kansas, USA to test the efficacy of pyrasulfotole & bromoxynil for broadleaf weed control and crop safety in winter wheat. Treatments included pyrasulfotole & bromoxynil alone at 253 g·ai·ha-1 and tank mixtures of pyrasulfotole & bromoxynil at 207 g·ai·ha-1 with MCPA at 280 g·ai·ha-1, dicamba at 140 g·ai·ha-1 or metsulfuron-methyl at 4.2 g·ai·ha-1. Herbicides were applied postemergence in fall and spring seasons. Pyrasulfotole & bromoxynil alone or in combination with tank-mix partners, regardless of application time, controlled flixweed, blue mustard, bushy wallflower and field pennycress 98% or more. Henbit control was better when pyrasulfotole & bromoxynil treatments were applied in fall than spring (≥98% vs ≥67%). Pyrasulfotole & bromoxynil alone applied in spring was not effective on wild buckwheat, but tank mixing with dicamba or metsulfuron-methyl controlled it 84% or more. Pyrasulfotole & bromoxynil alone or as tank mixture caused little (≤7%) or no injury to wheat and the injury did not influence wheat grain yields. Based on excellent control of broadleaf weeds evaluated, pyrasulfotole & bromoxynil is an alternative tool to control ALS-inhibitor resistant weeds in winter wheat. Fall season application and tank mixing with other herbicides are desirable for effective and broad spectrum weed control.

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Reddy, S. , Stahlman, P. , Geier, P. and Peterson, D. (2012) Broadleaf Weed Control and Crop Safety with Premixed Pyrasulfotole and Bromoxynil in Winter Wheat. American Journal of Plant Sciences, 3, 1613-1618. doi: 10.4236/ajps.2012.311195.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] USDA-NASS (US Department of Agriculture-National Agricultural Statistics Service), “Acreage-June 2012,” USDA-NASS, Washington, 2012.
[2] D. G. Swan, “Competition of Blue Mustard with Winter Wheat,” Weed Science, Vol. 19, No. 4, 1971, pp. 340-342.
[3] S. P. Conley and K. W. Bradley, “Wheat (Triticum aestivum) Yield Response to Henbit (Lamium amplexicaule) Interference and Simulated Winterkill,” Weed Technology, Vol. 19, No. 4, 2005, pp. 902-906. doi:10.1614/WT-04-252R.1
[4] F. E. Northam, P. W. Stahlman, and M. Abd El-Hamid, “Broadleaf weed Control in Winter Wheat,” Western Society of Weed Science Research Progress Report, Vol. 111, 1993, pp. 173-175.
[5] D. E. Peterson, “Weed Management,” Wheat Production Handbook, Kansas State University Cooperative Extension Service, Manhattan, 1997, C-529.
[6] I. Heap, “The International Survey of Herbicide Resistant Weeds,” 2012.
[7] D. E. Peterson, K. Al-Khatib and R. Roberts, “ALS Resistance in a Biotype of Bushy Wallflower,” Proceedings of Western Society of Weed Science, Vol. 59, 2006, p. 42.
[8] D. E. Peterson, K. Al-Khatib, C. R. Thompson and T. M. Maxwell, “Confirmation of ALS-Resistant Flixweed in Kansas,” Proceedings of Western Society of Weed Science, Vol. 62, 2009, p. 30.
[9] V. A. Andreas, “New HPPD-Inhibitors—A Proven Mode of Action as a New Hope to Solve Current Weed Problems,” Outlooks on Pest Management, Vol. 20, No. 1, 2009, pp. 27-30. doi:10.1564/20feb09
[10] A. Trebst, B. Depka, J. Jager and W. Oettmeier, “Reversal of the Inhibition of Photosynthesis by Herbicides Affecting Hydroxyphenylpyruvate Dioxygenase by Plastoquin-one and Tocopheryl Derivatives in Chlamydomonas reinhardii,” Pest Management Science, Vol. 60, 2004, pp. 669-674. doi:10.1002/ps.847
[11] A. Schulz, O. Oswald, P. Beyer and H. Kleinig, “SC-0051, a 2-Benzoyl-cyclohexane-1,3-dione Bleaching Herbicide, Is a Potent Inhibitor of the Enzyme p-Hydroxyphenylpyruvate Dioxygenase,” FEBS Letters, Vol. 318, 1993, pp. 162-166. doi:10.1016/0014-5793(93)80013-K
[12] J. Martin, C. Tutt and D. Call, “Herbicide Evaluation of Henbit Control in No-Till Wheat,” 2008.
[13] J. Felix and J. Ishida, “Huskie Herbicide Performance Relative to Commercial Standard Herbicides in Winter Wheat,” Malheur Experiment Station Annual Report 2008, Oregon State University, Ontario, 2009, pp. 151-152.
[14] C. R. Thompson, D. E. Peterson, W. H. Fick, P.W. Stahlman and R. E. Wolf, “Chemical Weed Control for Field Crops, Pastures, Rangeland, and Non-Cropland,” Report of Progress 1063, Kansas State University, Manhattan, 2012.
[15] T. A. Baughman and T. F. Peeper, “Red Horn Poppy (Glaucium corniculatum) Control in Winter Wheat,” Weed Technology, Vol. 6, No. 4, 1992, pp. 909-912.
[16] R. C. Scott, T. F. Peeper and J. A. Koscelny, “Winter Wheat (Triticum aestivum) Yield Response to Winter Annual Broadleaf Weed Control,” Weed Technology, Vol. 9, No. 3, 1995, pp. 594-598.

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