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Tolerance of flax (Linum usitatissimum) to fluthiacet-methyl, pyroxasulfone, and topramezone

  • Moria E. Kurtenbach (a1), Eric N. Johnson (a1), Robert H. Gulden (a2) and Christian J. Willenborg (a3)


Flax yield can be severely reduced by weeds. The combination of limited herbicide options and the spread of herbicide-resistant weeds across the prairies has resulted in a need for more weed control options for flax producers. The objective of this research was to evaluate the tolerance of flax to topramezone, pyroxasulfone, flumioxazin, and fluthiacet-methyl applied alone as well as in a mix with currently registered herbicides. These herbicides were applied alone and in mixtures at the 1X and 2X rates and compared with three industry standards and one nontreated control. This experiment was conducted at Carman, MB, and Saskatoon, SK, as a randomized complete block with four replications. Data were collected for crop population, crop height, yield, and thousand-seed weight. Ratings for crop damage (phytotoxicity) were also taken at three separate time intervals: 7 to 14, 21 to 28, and 56+ d after treatment. Crop tolerance to these herbicides varied between site-years. This was largely attributed to differences in spring moisture conditions and the differences in soil characteristics between sites. Herbicide injury was transient. Hence, no herbicide or combination of herbicides significantly impacted crop yield consistently. Flumioxazin was the least promising herbicide evaluated, as it caused severe crop damage (>90%) when conditions were conducive. Overall, flax had excellent tolerance to fluthiacet-methyl, pyroxasulfone, and topramezone. Flax had excellent crop safety to the combination of pyroxasulfone + sulfentrazone. However, mixing fluthiacet-methyl and topramezone with MCPA and bromoxynil, respectively, increased crop damage and would not be recommended.


Corresponding author

Author for correspondence: Moria E. Kurtenbach, Department of Plant Science, College of Agriculture and Bioresources, 51 Campus Drive, University of Saskatchewan, Saskatoon, SK S7N 5A8 (Email:


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Alister, C, Rojas, S, Gómez, P, Kogan, M (2008) Dissipation and movement of flumioxazin in soil at four field sites in Chile. Pest Manag Sci 64:579583
Anonymous (2012) Pyroxasulfone 85 WG product label. United Agri Products. Accessed: February 17, 2017
Bajwa, AA, Walsh, M, Chauhan, BS (2017) Weed management using crop competition in Australia. Crop Prot 95:813
Beckie, HJ, Lozinski, C, Shirriff, S, Brenzil, CA (2013) Herbicide-resistant weeds in the Canadian prairies: 2007–2011. Weed Technol 27:171183
Belfry, KD, McNaughton, KE, Sikkema, PH (2015) Weed control in soybean using pyroxasulfone and sulfrentrazone. Can J Plant Sci 95:11991204
Booker, HM, Rowland, GG, Rashid, KY (2014) CDC Glas oilseed flax. Can J Plant Sci 94:451452
Bowley, SR (2015) A Hitchhiker’s Guide to Statistics in Biology. Generalized Linear Mixed Model Edition. Kincardine, ON: Plants et al. 298 p
Canadian Weed Science Society (2018) Description of 0-100 Rating Scale for Herbicide Efficacy and Crop Phytotoxicity. Accessed: January 29, 2018
Diederichsen, A, Richards, K (2003) Cultivated flax and the genus Linum L. Taxonomy and germplasm conservation. in Muir, MD, Westcott, ND, eds. Flax: the Genus Linum. London: Taylor and Francis. Pp. 2254
Flax Council of Canada (2016) Growing Flax—Production Management & Diagnostic Guide. 5th ed. Saskatoon: Saskatchewan Flax Development Commission. 64 p
Freigang, J, Laber, B, Lange, G, Schulz, A (2008) The biochemistry of pyrasulfotole. Pflanzenschutz-Nachrichten Bayer 61:1527
Friesen, GH (1986) Effect of weed interference on yield and quality of flax seed oil. Can J Plant Sci 66:10371040
Ganie, ZA, Straman, G, Jhala, MJ (2015) Response of selected glyphosate-resistant broadleaved weeds to premix of fluthiacet-methyl and mesotrione (SolsticeTM) applied at two growth stages. Can J Plant Sci 95:861869
Gitsopoulos, TK, Melidis, V, Evgenidis, G (2010) Response of maize (Zea mays L.) to post-emergence applications of topramezone. Crop Prot 29:10911093
Government of Saskatchewan (2016) Guide to Crop Protection: Weeds, Plant Diseases, Insects. Saskatchewan: Saskatchewan Ministry of Agriculture. 651 p
Grossmann, K, Ehrhardt, T (2007) On the mechanism of action and selectivity of the corn herbicide topramezone: a new inhibitor of 4-hydroxyphenylpyruvate dioxygenase. Pest Manag Sci 63:429439
Hulting, AG, Dauer, JT, Hinds-Cook, B, Curtis, D, Koepke-Hill, RM, Mallory-Smith, C (2012) Management of Italian ryegrass (Lolium perenne spp. multiflorum) in western Oregon with preemergence applications of pyroxasulfone in winter wheat. Weed Technol 26:230235
Jursík, M, Soukup, J, Holec, J, Andr, J, Hamouzová, K (2015) Efficacy and selectivity of pre-emergent sunflower herbicides under different soil moisture condition. Plant Prot Sci 51:214222
King, SR, Garcia, JO (2008) Annual broadleaf control with KIH-485 in glyphosate-resistant furrow-irrigated corn. Weed Technol 22:420424
Leeson, JY, Thomas, AG, Hall, LM, Brenzil, CA, Andres, T, Brown, KR, Van Acker, RC(2005) Prairie Weed Surveys of Cereal, Oilseed and Pulse Crops 1970s to the 2000s. Weed Survey Series 05–1. Saskatoon: Agriculture and Agri-Food Canada, Saskatoon Research Center. 406 p
Liu, SH, Hsiao, AI, Quick, WA, Wolf, TM, Hume, JA (1995) Effect of MCPA and fenoxaprop on phytotoxicity, retention, foliar uptake and translocation of imazamethabenz in wild oat. Crop Prot 14:275281
Niekamp, JW, Johnson, WG, Smeda, RJ (1999) Broadleaf weed control with sulfentrazone and flumioxazin in no-tillage soybean (Glycine max). Weed Technol 13:233238
Nurse, RE, Sikkema, PH, Robinson, DE (2011) Weed control and sweet maize (Zea mays L.) yield as affected by pyroxasulfone dose. Crop Prot 30:789793
Olson, BLS, Zollinger, RK, Thompson, CR, Peterson, DE, Jenks, B, Moechnig, M, Stahlman, PW (2011) Pyroxasulfone with and without sulfentrazone in sunflower (Helianthus annuus). Weed Technol 25:217221
O’sullivan, PA, Friesen, HA, Vanden Born, WH (1977) Influence of herbicides for broad leaved weeds and adjuvants with dichlorfop methyl on wild oat control. Can J Plant Sci 57:117125
Price, AJ, Pline, WA, Cranmer, JR, Danehower, D (2004) Physiological basis for cotton tolerance to flumioxazin applied postemergence directed. Weed Sci 52:17
Qureshi, FA, Vanden Born, WA (1979) Split applications and tank mix combinations of diclofop-methyl and MCPA for weed control in barley. Can J Plant Sci 59:8792
Reddy, SS, Stahlman, PW, Geier, PW, Bean, BW, Dozier, T (2014) Grain sorghum response and Palmer amaranth control with postemergence application of fluthiacet-methyl. Int J Pest Manag 60:147152
Sarangi, D, Sandell, LD, Knezevic, SZ, Aulakh, JS, Lindquist, JL, Irmak, S, Jhala, AJ (2015) Confirmation and control of glyphosate-resistant common waterhemp (Amaranthus rudis) in Nebraska. Weed Technol 29:8292
Sebastian, DJ, Nissen, SJ, Westra, P, Shaner, DL, Butters, G (2017) Influence of soil properties and soil moisture on the efficacy of indaziflam and flumioxazin on Kochia scoparia L. Pest Manag Sci 73:444451
Senseman, SA, ed (2007) Herbicide Handbook. 9th ed. Lawrence, KS: Weed Science Society of America. 458 p
Shimizu, T, Hashimoto, N, Nakayama, I, Nakao, T, Mizutani, H, Unai, T, Yamaguchi, M, Abe, H (1995) A novel isourazole herbicide, fluthiacet-methyl, is a potent inhibitor of protoporphyrinogen oxidase after isomerization of glutathione S-transferase. Plant Cell Phys 36:625632
Sikkema, PH, Brown, L, Shropshire, C, Soltani, N (2007) Responses of three types of winter wheat (Triticum aestivum L.) to spring-applied post-emergence herbicides. Crop Prot 26:715720
Statistics Canada (2018) Table 001–0017. Estimated Areas, Yield, Production, Average Farm Price and Total Farm Value of Principal Field Crops, in Metric and Imperial Units Annual. Accessed: April 4, 2018
Stevenson, FC, Wright, AT (1996) Seeding rate and row spacing affect flax yield and weed interface. Can J Plant Sci 76:537544
Stewart, CL, Nurse, RE, Hamill, AS, Sikkema, PH (2010) Environment and soil conditions influence pre- and postemergence herbicide efficacy in soybean. Weed Technol 24:234243
Tanetani, Y, Ikeda, M, Kaku, K, Shimizu, T, Matsumoto, H (2013) Role of metabolism in the selectivity of a herbicide, pyroxasulfone, between wheat and rigid ryegrass seedlings. J Pest Sci 38:152156
Taylor-Lovell, S, Wax, LM, Bollero, G (2002) Preemergence flumioxazin and pendimethalin and postemergence herbicide systems for soybean (Glycine max). Weed Technol 16:502511
Tidemann, BD, Hall, LM, Johnson, EN, Beckie, HJ, Sapsford, KL, Raatz, LL (2014) Efficacy of fall- and spring-applied pyroxasulfone for herbicide-resistant weeds in field pea. Weed Technol 28:351360
Weed Science Society of America (2017) 2015 Baseline Survey for 26 Different Crop, Non-crop, Aquatic, and Natural Areas. Accessed: February 1, 2018
Zollinger, R (2016) National Weed Survey. Fargo: North Dakota State University. Accessed: February 16, 2017



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