Navigating a Critical Juncture for Sustainable Weed Management

  title={Navigating a Critical Juncture for Sustainable Weed Management},
  author={David A. Mortensen and J. Franklin Egan and Bruce D. Maxwell and Matthew R. Ryan and Richard G. Smith},
Agricultural weed management has become entrenched in a single tactic—herbicide—resistant crops—and needs greater emphasis on integrated practices that are sustainable over the long term. In response to the outbreak of glyphosate-resistant weeds, the seed and agrichemical industries are developing crops that are genetically modified to have combined resistance to glyphosate and synthetic auxin herbicides. This technology will allow these herbicides to be used over vastly expanded areas and will… 
Strategies for Reduced Herbicide Use in Integrated Pest Management
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Development of crop varieties resistant to multiple herbicides is being pursued as one strategy to respond to HR weeds and debates remain over the potential of this approach relative to a more comprehensive integrated weed management strategy to successfully delay resistance.


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An empirically-derived simulation model was developed to explore GR Conyza canadensis spread in relation to characteristics of the agricultural landscape and found large-scale reliance on glyphosate for weed management has increased high-fitness habitat and will result in rapid spread of glyphosate-resistant weeds.
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Glyphosate-resistant (GR) crops represent more than 80% of the 120 million ha of transgenic crops grown annually worldwide. GR crops have been rapidly adopted in soybean, maize, cotton, canola, and
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The continued evolution of herbicide resistance more than justifies continuing research and development efforts to produce integrated strategies and smarter herbicide use so as to achieve sustainable weed management.
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Information obtained in the development of glyphosate-resistant crops suggests that target-site alterations that decrease the herbicidal activity of glyphosate also may lead to reduced survival of a weed.
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Understanding resistance and building sustainable solutions to herbicide resistance evolution are necessary and worthy challenges to herbicides sustainability in world agriculture.