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Herbicide-Resistant Grass Weed Development in Imidazolinone-Resistant Wheat: Weed Biology and Herbicide Rotation

Published online by Cambridge University Press:  20 January 2017

Curtis R. Rainbolt ,
Donald C. Thill ,
Joseph P. Yenish  and
Daniel A. Ball
Curtis R. Rainbolt*
Affiliation:
Department of Plant, Soil, and Entomological Sciences, University of Idaho, Moscow, ID 83844-2339
Donald C. Thill
Affiliation:
Department of Plant, Soil, and Entomological Sciences, University of Idaho, Moscow, ID 83844-2339
Joseph P. Yenish
Affiliation:
Department of Crop and Soil Sciences, Washington State University, Pullman, WA 99164-6416
Daniel A. Ball
Affiliation:
Columbia Basin Agricultural Research Station, Oregon State University, Pendleton, OR 97801
*
Corresponding author's E-mail: crrainbolt@ifas.ufl.edu
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Abstract

A general life cycle model was modified to demonstrate how agronomic practices and weed biology factors affect the rate of appearance of herbicide-resistant downy brome, jointed goatgrass, and wild oat in Pacific Northwest wheat cropping systems. The model suggests herbicide rotation strategies for cropping systems that include imidazolinone-resistant wheat as a weed management tool. Simulation of continuous annual imidazolinone-resistant winter wheat and imazamox herbicide use resulted in the resistant soil seed banks of downy brome, jointed goatgrass, and wild oat surpassing their susceptible soil seed banks in 5, 7, and 10 yr, respectively. Reducing the initial seed bank density of downy brome before beginning a rotation that includes imidazolinone-resistant winter wheat reduces the likelihood of selecting for herbicide-resistant biotypes. The best simulated management option for reducing the total jointed goatgrass soil seed bank in low-precipitation areas is an imidazolinone-resistant winter wheat–fallow rotation. Rotations that include winter and spring crops and rotations that include non–group 2 herbicides minimize herbicide resistance selection pressure and reduce the wild oat soil seed bank.

Keywords

Imazamoxdowny brome, Bromus tectorum L. # BROTEjointed goatgrass, Aegilops cylindrica Host #3 AEGCYwild oat, Avena fatua L. # AVEFAwinter wheat, Triticum aestivum L. Clearfield™Crop rotationpopulation modelresistance managementALS, acetolactate synthasePNW, Pacific Northwest
Type
Extension/Outreach
Information
Weed Technology , Volume 18 , Issue 3 , September 2004 , pp. 860 - 868
Copyright
Copyright © Weed Science Society of America 

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Footnotes

∗ Published with approval of the Agricultural Experiment Station, University of Idaho, as Journal Article 03731.

References

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