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Reducing the Risks of Herbicide Resistance: Best Management Practices and Recommendations

Published online by Cambridge University Press:  20 January 2017

Jason K. Norsworthy*
Department of Crop, Soil, and Environmental Sciences, University of Arkansas, 1366 West Atheimer Drive, Fayetteville, AR 72704
Sarah M. Ward
Department of Crop, Soil, and Environmental Sciences, University of Arkansas, 1366 West Atheimer Drive, Fayetteville, AR 72704
David R. Shaw
GeoResources Institute, Mississippi State University, Mississippi State, MS 39762
Rick S. Llewellyn
CSIRO Sustainable Ecosystems, Private Bag 2, Glen Osmond, South Australia 5064, Australia
Robert L. Nichols
Cotton Incorporated, 6399 Weston Parkway, Cary, NC 27513
Theodore M. Webster
Crop Protection and Management Research Unit, USDA–Agricultural Research Service, Tifton, GA 31794
Kevin W. Bradley
Division of Plant Sciences, University of Missouri, Columbia, MO 65211
George Frisvold
Department of Agricultural and Resource Economics, 319 Economics Building, University of Arizona, Tucson, AZ 85721
Stephen B. Powles
Western Australian Herbicide Resistance Initiative, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia
Nilda R. Burgos
Department of Crop, Soil, and Environmental Sciences, University of Arkansas, 1366 West Atheimer Drive, Fayetteville, AR 72704
William W. Witt
Department of Plant and Soil Sciences, 105 Plant Science Building, University of Kentucky, Lexington, KY 40546
Michael Barrett
Department of Plant and Soil Sciences, 105 Plant Science Building, University of Kentucky, Lexington, KY 40546
Corresponding author's E-mail:
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Herbicides are the foundation of weed control in commercial crop-production systems. However, herbicide-resistant (HR) weed populations are evolving rapidly as a natural response to selection pressure imposed by modern agricultural management activities. Mitigating the evolution of herbicide resistance depends on reducing selection through diversification of weed control techniques, minimizing the spread of resistance genes and genotypes via pollen or propagule dispersal, and eliminating additions of weed seed to the soil seedbank. Effective deployment of such a multifaceted approach will require shifting from the current concept of basing weed management on single-year economic thresholds.

Weed Biology and Ecology
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Copyright © Weed Science Society of America


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