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Changes in Herbicide Use Patterns and Production Practices Resulting from Glyphosate-Resistant Crops

  • Bryan G. Young (a1)

Recent shifts in herbicide use patterns can be attributed to rapid, large-scale adoption of glyphosate-resistant soybean and cotton. A dramatic increase in glyphosate use is the most obvious change associated with the adoption of glyphosate-resistant crops. Consequently, the diversity of herbicides used for weed management in these crops has declined, particularly in soybean. To date, the availability of glyphosate-resistant corn has limited the use of glyphosate in corn. While exploiting the benefits of glyphosate-resistant crops, many growers have abandoned the principles of sound weed and herbicide-resistance management. Instead of incorporating glyphosate into a resistance management strategy utilizing multiple herbicide sites of action, many growers rely exclusively upon glyphosate for weed control. Although it is difficult to establish a clear relationship between the adoption of glyphosate-resistant crops and changes in other crop production practices, the increase in no-till and strip-till production of cotton and soybean between 1995 and 2002 may have been facilitated by glyphosate-resistant crops.

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C. D. Dalley , J. J. Kells , and K. A. Renner 2004. Effect of glyphosate application timing and row spacing on corn (Zea mays) and soybean (Glycine max) yields. Weed Technol. 18:165176.

S. A. Gower , M. M. Loux , and J. Cardina et al. 2003. Effect of postemergence glyphosate application timing on weed control and grain yield in glyphosate-resistant corn: results of a 2-yr multistate study. Weed Technol. 17:821828.

W. G. Johnson , P. R. Bradley , S. E. Hart , M. L. Buesinger , and R. E. Massey 2000. Efficacy and economics of weed management in glyphosate-resistant corn (Zea mays). Weed Technol. 14:5765.

C. L. Main , T. C. Mueller , R. M. Hayes , and J. B. Wilkerson 2004. Response of selected horseweed (Conyza canadensis (L.) Cronq.) populations to glyphosate. J. Agric. Food Chem. 52:879883.

M. A. Martinez-Ghersa , C. A. Worster , and S. R. Radosevich 2003. Concerns a weed scientist might have about herbicide-tolerant crops: a revisitation. Weed Technol. 17:202210.

K. N. Reddy and K. Whiting 2000. Weed control and economic comparisons of glyphosate-resistant, sulfonylurea-tolerant, and conventional soybean (Glycine max) systems. Weed Technol. 14:204211.

M. J. VanGessel 2001. Glyphosate-resistant horseweed from Delaware. Weed Sci. 49:703705.

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Weed Technology
  • ISSN: 0890-037X
  • EISSN: 1550-2740
  • URL: /core/journals/weed-technology
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