Skip to main content Accessibility help
×
Home

Influence of Glyphosate/Dicamba Application Rate and Timing on the Control of Glyphosate-Resistant Horseweed in Glyphosate/Dicamba-Resistant Soybean

  • Brittany K. Hedges (a1), Nader Soltani (a2), David C. Hooker (a3), Darren E. Robinson (a3) and Peter H. Sikkema (a4)...

Abstract

Dicamba may be an efficacious option for the control of glyphosate-resistant (GR) horseweed in glyphosate/dicamba-resistant soybean; research is needed to optimize the application rate based on horseweed height at the time of application. The purpose of this study was to determine the effect of glyphosate/dicamba rate and application timing for the control of GR horseweed. Glyphosate/dicamba was applied at three rates (900, 1,350, and 1,800 g ae ha−1) at three horseweed application timings (5, 15, and 25 cm) in a factorial design. There was no interaction between glyphosate/dicamba rate and timing for GR horseweed control or soybean yield; however, there was an interaction for GR horseweed density and biomass. At 2 and 4 wk after application (WAA), there was a decrease in GR horseweed control as the height at the time application increased. At 4 WAA, the application of glyphosate/dicamba to GR horseweed that was 5-, 15-, and 25-cm tall provided 87%, 76%, and 62% control, respectively. There was no impact of glyphosate/dicamba application timing on soybean yield. At 2, 4, and 8 WAA, there was an increase in GR horseweed control as the rate of glyphosate/dicamba was increased. At 8 WAA, glyphosate/dicamba applied at 900, 1,350, and 1,800 g ae ha−1 controlled GR horseweed 76%, 87%, and 92%, respectively. Earlier application timings and higher rates of glyphosate/dicamba caused the greatest reduction in GR horseweed density and biomass. Reduced GR horseweed competition resulted in a 100% to 144% increase in soybean yield, but there was no difference in soybean yield among glyphosate/dicamba rates tested.

Copyright

Corresponding author

Author for correspondence: Nader Soltani, Department of Plant Agriculture, University of Guelph Ridgetown Campus, Ridgetown, ON N0P 2C0, Canada. (Email: soltanin@uoguelph.ca)

References

Hide All
Bruce, JA, Kells, JJ (1990) Horseweed (Conyza canadensis) control in no-tillage soybeans (Glycine max) with pre-plant and preemergence herbicides. Weed Technol 4:642647
Budd, CM (2016) Improving the Consistency of Glyphosate-Resistant Canada Fleabane (Conyza canadensis) Control with Saflufenacil: Distribution and Control in Soybean (Glycine max). M.Sc thesis, University of Guelph, Guelph, ON, Canada. 51 p
Budd, CM, Soltani, N, Robinson, DE, Hooker, DC, Miller, RT, Sikkema, PH (2016) Control of glyphosate resistant Canada fleabane with saflufenacil plus tankmix partners in soybean. Can J Plant Sci 96:989994
Burnside, OC, Lavy, TL (1966) Dissipation of dicamba. Weed Sci 14:211214
Byker, HP, Soltani, N, Robinson, DE, Tardif, FJ, Lawton, MB, Sikkema, PH (2013) Occurrence of glyphosate and cloransulam resistant Canada fleabane (Conyza canadensis L. Cronq.) in Ontario. Can J Plant Sci 93:851855
Cobb, AH, Reade, JP (2010) Herbicides and Plant Physiology. 2nd ed. Hoboken, NJ: Wiley. 296 p
Dauer, JT, Mortensen, DA, Humston, R (2006) Controlled experiments to predict horseweed (Conyza canadensis) dispersal distances. Weed Sci 54:484489
Dill, GM (2005) Glyphosate-resistant crops: history, status and future. Pest Manag Sci 61:219224
Duke, SO, Powles, SB (2008) Glyphosate: a once-in-a-century herbicide. Pest Manag Sci 64:319325
Franz, JE, Mao, MK, Sikorski, JA (1997) Glyphosate: A Unique Global Herbicide (ACS Monograph 189). Washington, DC: American Chemical Society. 653 p
Hartzler, RG, Singer, JW, Kohler, KA, Buhler, DD (2006) Effect of repeated glyphosate use on weed communities in a soybean–corn rotation. Crop Manag, 10.1094/CM-2006-0308-01-RS
Heap, I (2018) The International Survey of Herbicide Resistant Weeds. www.weedscience.org. Accessed: February 16, 2018
Kruger, GR, Davis, VM, Weller, SC, Johnson, WG (2010) Control of horseweed (Conyza canadensis) with growth regulator herbicides. Weed Technol 24:425429
Loux, M, Stachler, J, Johnson, B, Nice, G, Davis, V, Nordby, D (2006) Biology and Management of Horseweed. Purdue University Extension. https://www.extension.purdue.edu/extmedia/gwc/gwc-9-w.pdf. Accessed: February 16, 2018
Main, CL, Steckel, LE, Hayes, RM, Mueller, TC (2006) Biotic and abiotic factors influence horseweed emergence. Weed Sci 54:11011105
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, Eubank, TW, Poston, DH, Koger, CH, Reddy, KN (2006) Factors affecting germination of horseweed (Conyza canadensis). Weed Sci 54:898902
Shaner, DL (2014) Dicamba. Herbicide Handbook. 10th ed. Lawrence, KS: Weed Science Society of America. pp 139141
Smith, AE (1973) Degradation of dicamba in prairie soils. Weed Res 13:373378
Tozzi, E, Beckie, H, Weiss, R, Gonzalez-Andujar, JL, Storkey, J, Cici, SZH, Van Acker, RC (2014) Seed germination response to temperature for a range of international populations of Conyza canadensis . Weed Res 54:178185
Tozzi, E, Van Acker, RC (2014) Effects of seedling emergence timing on the population dynamics of horseweed (Conyza canadensis var. canadensis). Weed Sci 62:451456
Van Acker, RC, Swanton, CJ, Weise, SF (1993) The critical period of weed control in soybean [Glycine max (L.) Merr.]. Weed Sci 41:194200
VanGessel, MJ (2001) Glyphosate-resistant horseweed from Delaware. Weed Sci 49:703705

Keywords

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed