Responses of Four Types of Winter Wheat to Fenoxaprop-p-ethyl


Fenoxaprop-p-ethyl is a selective grass herbicide that if registered will provide winter wheat growers with an additional weed control option. Field experiments were established in the fall of 2011, 2012 and 2013 at Ridgetown and Exeter, Ontario, to determine the sensitivity of four market classes of winter wheat [Soft white winter wheat (SWWW), soft red winter wheat (SRWW), hard white winter wheat (HWWW) and hard red winter wheat (HRWW)] to 1X and 2X fenoxaprop-p-ethyl/safener at early-(EPOST) or late-post emergence (LPOST) application timings. Fenoxaprop-p-ethyl/safener applied LPOST at 1X and 2X the manufacturer’s proposed label rate caused 4% and 5% injury 1 week after application (WAA), respectively. The injury observed was transient with 1% injury 2 WAA. Winter wheat height ranged from 91 to 95, 76 to 77, 76 to 79 and 90 to 93 cm while grain yield was 6.2 to 6.4, 6.1 to 7.1, 5.5 to 5.8 and 5.6 to 6.2 t?ha?1 for SWWW, SRWW, HRWW and HRWW, respectively. Exeter sites were not affected by fenoxaprop-p-ethyl/ safener treatment. At Ridgetown and Exeter, no market class-specific response was identified for the cultivars evaluated. Based on this study, fenoxaprop-p-ethyl/safener has the potential to cause only minor and transient injury in winter wheat that will not decrease yield. Furthermore, this research supports the registration of fenoxaprop-p-ethyl/safener for spring POST application in winter wheat in Ontario.

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Belfry, K. and Sikkema, P. (2015) Responses of Four Types of Winter Wheat to Fenoxaprop-p-ethyl. Agricultural Sciences, 6, 195-200. doi: 10.4236/as.2015.62018.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] Agriculture and Agri-Food Canada (2010) Crop Profile for Winter Wheat in Canada.
[2] Kulasekera, K. (2014) Estimated Area, Yield, Production and Farm Value of Specified Field Crops, Ontario, 2011-2013. Ontario Ministry of Agriculture, Food and Rural Affairs, Guelph.
[3] Salmon, D. and McLelland, M. (2012) Winter Wheat in the Parkland Area of Alberta.$department/deptdocs.nsf/all/agdex94/$file/112_11-1.pdf?OpenElement
[4] Entz, M.H., Fowler, D.B., Entz, M.H. and Fowler, D.B. (1991). Agronomic Performance of Winter versus Spring Wheat. Agronomy Journal, 83, 527-532.
[5] Sikkema, P.H., Brown, L., Shropshire, C. and Soltani, N. (2007) Responses of Three Types of Winter Wheat (Triticum aestivum L.) to Spring-Applied Post-Emergence Herbicides. CropProtection, 5, 715-720.
[6] Kong, L. et al. (2009) Differential Responses of Two Types of Winter Wheat (Triticum aestivum L.) to Autumn- and Spring-Applied Mesosulfuron-Methyl. Crop Protection, 28, 387-392.
[7] Schroeder, J. and Banks, P.A. (1989) Soft Red Winter Wheat (Triticum aestivum) Response to Dicamba and Dicamba plus 2, 4-D. Weed Technology, 3, 67-71.
[8] Rinella, J.M., Kells, J.J. and Ward, R.W. (2001) Response of “Wakefield” Winter Wheat (Triticum aestivum) to Dicamba. Weed Technology, 15, 523-529.[0523:ROWWWT]2.0.CO;2
[9] Mallory-Smith, C.A. and Retzinger, E.J. (2003) Revised Classification of Herbicides by Site of Action for Weed Resistance Management Strategies. Weed Technology, 17, 605-619.[0605:RCOHBS]2.0.CO;2
[10] Incledon B.J. and Hall J.C. (1997) Acetyl-Coenzyme a Carboxylase: Quaternary Structure and Inhibition by Graminicidal Herbicides. Pesticide Biochemisty and Physiology, 57, 255-271.
[11] Gronwald, J.W. (1991) Lipid Biosynthesis Inhibitors. Weed Science, 39, 435-449.
[12] Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA) (2013) Guide to Weed Control 2014-2015: Publication 75. Queen’s Printer for Ontario, Toronto.
[13] Cataneo, A.C., Ferreira, L.C., Mischan, M.M., Velini, E.D., Corniani, N.V. and Cerdeira, A.L. (2013) Mefenpyr-Diethyl Action on Fenoxaprop-p-Ethyl Detoxification in Wheat Varieties. Planta Daninha, 31, 387-393.
[14] Hacker, E. Bieringer, H., Willms, L., R?sch, W., K?cher, H. and Wolf, R. (2000) Mefenpyr-Diethyl: A Safener for Fenoxaprop-p-Ethyl and Iodosulfuron in Cereals. Zeitschrift für Pflanzenkrankheiten und Pflanzenschutz, 439-500.
[15] Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA) (2009) Agronomy Guide for Field Crops: Publication 811. Queen’s Printer for Ontario, Toronto.
[16] Xie, H.S., Quick, W.A. and Hsiao, A.I. (1994) Spring Cereal Response to Imazamethabenz and Fenoxaprop-p-Ethyl as Influenced by Environment. Weed Technology, 8, 713-716.
[17] Soltani, N., Shropshire, C. and Sikkema, P.H. (2011) Sensitivity of Durum Wheat (Triticum turgidum) to Various Postemergence Herbicides. Agricultural Sciences, 2, 451-456.
[18] Robinson, M.A., Letarte, J., Cowbrough, M.J., Sikkema, P.H. and Tardif, F.J. (2014) Response of Underseeded Red Clover (Trifolium pratense L.) to Winter Wheat (Triticum aestivum L.) Herbicides as Affected by Application Timing. Agricultural Sciences, 5, 1351-1360.
[19] Raatz, L., Hills, M., McKenzie, R., Yang, R-C., Topinka, K. and Hall, L. (2011) Tolerance of Spring Triticale (× Triticosecale wittmack) to Four Wheat Herbicides. Weed Technology, 25, 84-89.
[20] Lemerle, D., Leys, A.R., Hinkley, R.B., Fisher, J.A. and Cullis, B. (1985) Tolerances of Wheat Cultivars to Post-Emergence Wild Oat Herbicides. Animal Production Science, 25, 677-682.
[21] Shaw, D.R. and Wesley, M.T. (1991) Wheat (Triticum aestivum) Cultivar Tolerance and Italian Ryegrass (Lolium multiflorum) Control with Diclofop, BAY SMY 1500, and Metribuzin. Weed Technology, 5, 776-781.
[22] Tottman, D.R., Lupton, F.G.H., Oliver, R.H. and Preston, S.R. (1982) Tolerance of Several Wild Oat Herbicides by a Range of Winter Wheat Varieties. Annals of Applied Biology, 100, 365-373.

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