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Efficacy of Saflufenacil for Control of Glyphosate-Resistant Horseweed (Conyza canadensis) as Affected by Height, Density, and Time of Day

  • Christopher M. Budd (a1), Nader Soltani (a1), Darren E. Robinson (a1), David C. Hooker (a1), Robert T. Miller (a2) and Peter H. Sikkema (a1)...

Abstract

Control of glyphosate-resistant (GR) horseweed in soybean with glyphosate (900 g ai ha−1) plus saflufenacil (25 gaiha−1) has been variable. The objective of this research was to determine the effect of GR horseweed height, density, and time of day (TOD) at application on saflufenacil plus glyphosate efficacy in soybean. All experiments were completed six times during a 2 yr period (2014, 2015) in fields previously confirmed with GR horseweed. Applications from 0900 to 2100 hours provided optimal control of GR horseweed 8 WAA. Soybean yield paralleled GR horseweed control with the highest yield of 3000kgha−1 at 1500 hours, and the lowest yield of 2400kgha−1 at 0600 hours. The height and density of GR horseweed at application had minimal effect on saflufenacil efficacy. Saflufenacil provided>99% control of GR horseweed when applied to small plants and low densities; however, control decreased to 95% when>25 cm tall, and to 96% in densities>800 plants m−2 at 6 WAA due to some plant regrowth. TOD of application had a greater influence on GR horseweed control with saflufenacil than height or density. To optimize control of GR horseweed, saflufenacil should be applied during daytime hours to small plants at low densities. Optimizing GR horseweed control minimizes weed seed return and weed interference.

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*Corresponding author’s E-mail: soltanin@uoguelph.ca

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Associate Editor for this paper: Timothy Grey, University of Georgia

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References

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Andersen, RN, Koukkari, WL (1978) Response of velvetleaf (Abutilon theoprasti) to bentazon as affected by leaf orientation. Weed Sci 26:393395
Bhowmik, PC, Bekech, MM (1993) Horseweed (Conyza canadensis) seed production, emergence and distribution in no-tillage and conventional tillage corn (Zea mays). Trends Agric Sci 1:6771
Budd, C, Soltani, N, Robinson, DE, Hooker, DC, Miller, RT, Sikkema, PH (2016) Control of glyphosate resistant Canada fleabane with glyphosate plus saflufenacil plus tankmix partners in soybean. Can J Plant Sci 96:989994
Byker, HP, Soltani, N, Robinson, DE, Tardif, FJ, Lawton, MB, Sikkema, PH (2013a) Control of glyphosate-resistant Canada fleabane [Conyza canadensis (L.) Cronq.] with preplant herbicide tankmixes in soybean [Glycine max. (L.). Merr.]. Can J Plant Sci 93:659667
Byker, HP, Soltani, N, Robinson, DE, Tardif, FJ, Lawton, MB, Sikkema, PH (2013b) Control of glyphosate-resistant horseweed (Conyza canadensis) with dicamba applied preplant and postemergence in dicamba-resistant soybean. Weed Technol 27:492496
Byker, HP, Soltani, N, Robinson, DE, Tardif, FJ, Lawton, MB, Sikkema, PH (2013c) Occurrence of glyphosate and cloransulam resistant Canada fleabane (Conyza canadensis L. Cronq.) in Ontario. Can J Plant Sci 93:851855
Coetzer, E, Al-Khatiband, K, Loughin, TM (2001) Glufosinate efficacy, absorption, and translocation in amaranth as affected by relative humidity and temperature. Weed Sci 49:813
Davis, VM, Gibson, KD, Bauman, TT, Weller, SC, Johnson, WG (2009) Influence of weed management practices and crop rotation on glyphosate-resistant horseweed (Conyza canadensis) population dynamics and crop yield- years III and IV. Weed Sci 57:417426
Doran, DL, Andersen, RN (1976) Effectiveness of bentazon applied at various times of the day. Weed Sci 24:567570
Ford, L, Soltani, N, Robinson, DE, Nurse, RE, McFadden, A, Sikkema, PH (2014a) Canada fleabane (Conyza canadensis) control with preplant applied residual herbicides followed by 2,4-D choline/glyphosate DMA applied postemergence in corn. Can J Plant Sci 94:12311237
Ford, L, Soltani, N, Robinson, DE, Nurse, RE, McFadden, A, Sikkema, PH (2014b) Efficacy of 2,4-D choline/glyphosate dimethylamine on glyphosate resistant Canada fleabane (Conyza canadensis) at different sizes. Am J Plant Sci 5:27552763
Frankton, C, Mulligan, GA (1987) Weeds of Canada. Toronto, ON: NC Press Limited. 217 p
Grossmann, K, Niggeweg, R, Christiansen, N, Looser, R, Ehrhardt, T (2010) The herbicide saflufenacil (KixorTM) is a new inhibitor of protoporphyrinogen IX oxidase activity. Weed Sci 58:19
Ikley, JT (2012). The Utility of Saflufenacil on Glyphosate-Resistant Horseweed and Its Effect on Select Soybean Varieties. Master’s thesis. College Park, MD: University of Maryland. 78 p. http://hdl.handle.net/1903/12803
Johnson, BC, Young, BG (2002) Influence of temperature and relative humidity on the foliar activity of mesotrione. Weed Sci 50:157161
Kraatz, GW, Andersen, RN (1980) Leaf movements in sicklepod (Cassia obtusifolia) in relation to herbicide response. Weed Sci 28:551556
Loux, M, Stachler, J, Johnson, B, Nice, G, Davis, V, Nordby, D (2006) Biology and Management of Horseweed. The Glyphosate, Weeds , and Crops Series. Purdue Extension. https://www.extension.purdue.edu/extmedia/gwc/gwc-9-w.pdf. Accessed: April 30, 2014
Mellendorf, TG, Young, JM, Matthews, JL, Young, BG (2013) Influence of plant height and glyphosate on saflufenacil efficacy on glyphosate-resistant horseweed (Conyza canadensis). Weed Technol 27:463467
Nandula, VK, Reddy, KN, Duke, SO, Poston, DH (2005) Glyphosate-resistant weeds: current status and future outlook. Outlooks Pest Manag 16:183187
Royer, F, Dickinson, R (1999). Weeds of Canada and the Northern United States. Edmonton, AB: University of Alberta Press. Pp 3637
Shields, EJ, Dauer, JT, VanGessel, MJ, Neumann, G (2006) Horseweed (Conyza canadensis) seed collected in the planetary boundary layer. Weed Sci 54:10631067
Smisek, A (1995). Resistance to paraquat in Erigeron canadensis L. M.Sc. thesis. London, ON: University of Western Ontario. 102 p
Stewart, CL, Nurse, RE, Sikkema, PH (2009) Time of day impacts postemergence weed control in corn. Weed Technol 23:346355
[UCLA] University of California–Los Angeles Statistical Consulting Group. (2016). SAS Library- Non Linear Regression in SAS. from http://www.ats.ucla.edu/stat/sas/library/SASNLin_os.htm. Accessed: February 17, 2016
VanGessel, MJ (2001) Glyphosate-resistant horseweed from Delaware. Weed Sci 49:703705
Weaver, SE (2001) The biology of Canadian weeds. 115. Conyza canadensis . Can J Plant Sci 81:867875
Zelaya, IA, Owen, MDK, VanGessel, MJ (2004) Inheritance of evolved glyphosate resistance in Conyza canadensis (L.) Cronq. Theor Appl Genet 110:5870

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Efficacy of Saflufenacil for Control of Glyphosate-Resistant Horseweed (Conyza canadensis) as Affected by Height, Density, and Time of Day

  • Christopher M. Budd (a1), Nader Soltani (a1), Darren E. Robinson (a1), David C. Hooker (a1), Robert T. Miller (a2) and Peter H. Sikkema (a1)...

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