Glyphosate-Induced Weed Shifts1

By A. Culpepper. Weed technology, 2006

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U.S. Grower Views on Problematic Weeds and Changes in Weed Pressure in Glyphosate-Resistant Corn, Cotton, and Soybean Cropping Systems (2009, background): “Interestingly, the survey reported by Culpepper (2006) indicated that 67 and 50% of weed scientists surveyed consider morningglory and pigweed, respectively, to be more problematic after GR cotton adoption.”
Influence of glyphosate-resistant cropping systems on weed species shifts and glyphosate-resistant weed populations (2009, background): “…cropping systems on weed species shifts and 16/j.eja.2009.03.008 concern because the species that are becoming more abundant are species that are either resistant or more difficult to control with glyphosate, and the utility of GR cropping systems will continue to deteriorate (Culpepper, 2006).”
Evolution of Resistance to Auxinic Herbicides: Historical Perspectives, Mechanisms of Resistance, and Implications for Broadleaf Weed Management in Agronomic Crops (2011, background): “…below, several cases of weed shifts have been documented since the introduction of GR soybean, cotton, and corn in the 1990s, likely due to the intense selection pressure from relying on glyphosate and the concomitant reduction in the amount of tillage used in agronomic crops (Culpepper 2006).”