Skip to main content Accessibility help
×
Home

Problem Weed Control in Glyphosate-Resistant Soybean with Glyphosate Tank Mixes and Soil-Applied Herbicides

  • Stevan Z. Knezevic (a1), Avishek Datta (a1), Jon Scott (a1), Robert N. Klein (a2) and Jeff Golus (a2)...

Abstract

Although glyphosate controls many plant species, certain broadleaf weeds in Nebraska's cropping systems exhibit various levels of tolerance to the labeled rates of this herbicide, including ivyleaf morningglory, Venice mallow, yellow sweetclover, common lambsquarters, velvetleaf, kochia, Russian thistle, and field bindweed. Therefore, two field studies were conducted in 2004 and 2005 at Concord and North Platte, NE, to evaluate performance of (1) seven preemergence (PRE) herbicides and (2) glyphosate tank mixes applied postemergence (POST) at three application times for control of eight weed species that are perceived as problem weeds in glyphosate-resistant soybean in Nebraska. The PRE herbicides, including sulfentrazone plus chlorimuron, pendimethalin plus imazethapyr, imazaquin, and pendimethalin plus imazethapyr plus imazaquin provided more than 85% control of most weed species tested in this study 28 d after treatment (DAT). However, sulfentrazone plus chlorimuron and pendimethalin plus imazethapyr plus imazaquin were the only PRE treatments that provided more than 80% control of most weed species 60 DAT. In the POST glyphosate tank-mix study, the level of weed control was significantly affected by the timing of herbicide application; control generally decreased as weed height increased. In general, glyphosate tank mixes applied at the first two application times (early or mid-POST) with half label rates of lactofen, imazamox, imazethapyr, fomesafen, imazaquin, or acifluorfen, provided more than 80% control of all species that were 20 to 30 cm tall except ivyleaf morningglory, Venice mallow, yellow sweetclover, and field bindweed. Glyphosate tank mixes applied late POST with lactofen, imazethapyr, or imazaquin provided more than 70% control of common lambsquarters, velvetleaf, kochia, and Russian thistle that were 30 to 50 cm tall. Overall, glyphosate tank mixes with half label rates of chlorimuron or acifluorfen were the best treatments; they provided more than 80% control of all the studied weed species when applied at early growth stages. Results of this study suggested that mixing glyphosate with other POST broadleaf herbicides, or utilizing soil-applied herbicides after crop planting helped effectively control most problematic weeds in glyphosate-resistant soybean in Nebraska.

Copyright

Corresponding author

Corresponding author's E-mail: sknezevic2@unl.edu.

References

Hide All
Davis, V.M., Johnson, W.G., and Gibson, K.D. 2005. An update on the distribution of glyphosate-resistant horseweed (Conyza canadensis) in Indiana. Proc. North Cent. Weed Sci. Soc 60:198.
Ellis, J.M. and Griffin, J.L. 2002. Benefits of soil-applied herbicides in glyphosate-resistant soybean (Glycine max). Weed Technol 16:541547.
Elmore, C.D., Hurst, H.R., and Austin, D.F. 1990. Biology and control of morningglories (Ipomoea spp.). Rev. Weed Sci 5:83114.
Evans, S.P., Knezevic, S.Z., Shapiro, C.A., and Lindquist, J.L. 2003. Nitrogen level affects critical period for weed control in corn. Weed Sci 51:408417.
Ferrell, J.A. and Witt, W.W. 2002. Comparison of glyphosate with other herbicides for weed control in corn: efficacy and economics. Weed Technol 16:701706.
Gonzini, L.C., Hart, S.E., and Wax, L.M. 1999. Herbicide combinations for weed management in glyphosate-resistant soybean (Glycine max). Weed Technol 13:354360.
Heap, I.M. 2008. International Survey of Herbicide Resistant Weeds. http://www.weedscience.org/summary/MOASummary.asp. Accessed: September 25, 2008.
Holloway, J.C. Jr. and Shaw, D.R. 1995. Influence of soil-applied herbicides on ivyleaf morningglory (Ipomoea hederacea) growth and development in soybean (Glycine max). Weed Sci 43:655659.
Holloway, J.C. Jr. and Shaw, D.R. 1996. Effect of herbicides on ivyleaf morningglory (Ipomoea hederacea) interference in soybean (Glycine max). Weed Sci 44:860864.
Holt, J.S. 1992. History of identification of herbicide-resistant weeds. Weed Technol 6:615620.
Knezevic, S.Z. 2006. Weeds species on the increase in eastern Nebraska. Pages 122131. in. Proceedings of the 2006 Crop Protection Clinics. Lincoln, NE: Univ. of Nebraska.
Knezevic, S.Z. 2007. Herbicide tolerant crops: 10 years later. Maydica 52:245250.
Knezevic, S.Z., Evans, S.P., Blankenship, E.E., VanAcker, R.C., and Lindquist, J.L. 2002. Critical period of weed control: the concept and data analysis. Weed Sci 50:773786.
Knezevic, S.Z., Evans, S.P., and Mainz, M. 2003a. Yield penalty due to delayed weed control in corn and soybean. Crop Manag. J. http://www.plantmanagementnetwork.org/pub/cm/research/2003/delay/. Accessed: October 20, 2008.
Knezevic, S.Z., Evans, S.P., and Mainz, M. 2003b. Row spacing influences critical time of weed removal in soybean. Weed Technol 17:666673.
Knezevic, S.Z. and Klein, R.N. 2005. Glyphosate dose response curves and selectivity for control of problem weeds in Roundup-Ready soybean. Proc. North Cent. Weed Sci. Soc 60:149.
Knezevic, S.Z., Sikkema, P.H., Tardif, F., Hamill, A.S., Chandler, K., and Swanton, C.J. 1998. Biologically effective dose and selectivity of RPA 201772 (isoxaflutole) for preemergence weed control in corn (Zea mays). Weed Technol 12:670676.
Kniss, A.R., Miller, S.D., and Wilson, R.G. 2005. Common lambsquarters control with glyphosate: what's the problem. Proc. North Cent. Weed Sci. Soc 60:200.
Krausz, R.F. and Kapusta, G. 1994. Annual weed control with glyphosate at several rates, weed sizes, and spray volumes. Proc. North Cent. Weed Control Conf 49:120121.
Lanie, A.J., Griffin, J.L., Vidrine, P.R., and Reynolds, D.B. 1994. Herbicide combinations for soybean (Glycine max) planted in stale seedbed. Weed Technol 8:1722.
Lee, L.J. and Ngim, J. 2000. A first report of glyphosate-resistant goosegrass (Eleusine indica (L) Gaertn) in Malaysia. Pest Manag. Sci 56:336339.
Lich, J.M., Renner, K.A., and Penner, D. 1997. Interaction of glyphosate with postemergence soybean (Glycine max) herbicides. Weed Sci 45:1221.
Powles, S.B., Lorraine-Colwill, D.F., Dellow, J.J., and Preston, C. 1998. Evolved resistance to glyphosate in rigid ryegrass (Lolium rigidum) in Australia. Weed Sci 46:604607.
Reynolds, D.B., Jordan, D.L., Vidrine, P.R., and Griffin, J.L. 1995. Broadleaf weed control with trifluralin plus flumetsulam in soybean (Glycine max). Weed Technol 9:446451.
SAS, 1999. SAS. Version 8.1. Cary, NC: SAS Institute.
Smeda, R.J., Pollard, J.M., and Sellers, B.A. 2005. Documenting the extent of glyphosate-resistant common ragweed. Proc. North Cent. Weed Sci. Soc 60:152.
VanGessel, M. 2001. Glyphosate-resistant horseweed from Delaware. Weed Sci 49:703705.
Vencill, W.K., Wilcut, J.W., and Monks, C.D. 1995. Efficacy and economy of weed management systems for sicklepod (Senna obtusifolia) and morningglory (Ipomoea spp.) control in soybean (Glycine max). Weed Technol 9:456461.
Wilson, J.S. and Worsham, A.D. 1988. Combinations of nonselective herbicides for difficult to control weeds in no-till corn (Zea mays) and soybean (Glycine max). Weed Sci 36:648652.
Wilson, R.G., Miller, S.D., Kniss, A.R., Westra, P., and Stahlman, P.W. 2005. Risk of weed spectrum shifts and herbicide resistance in irrigated Roundup-Ready cropping systems—a western Nebraska perspective after 8 years. Proc. North Cent. Weed Sci. Soc 60:138.

Keywords

Related content

Powered by UNSILO

Problem Weed Control in Glyphosate-Resistant Soybean with Glyphosate Tank Mixes and Soil-Applied Herbicides

  • Stevan Z. Knezevic (a1), Avishek Datta (a1), Jon Scott (a1), Robert N. Klein (a2) and Jeff Golus (a2)...

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.