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Effect of Seeding Rate on Dose Response of Wild Mustard (Sinapis arvensis) to Fluthiacet-Methyl

Published online by Cambridge University Press:  09 June 2017

Collen Redlick ,
Hema S. N. Duddu ,
Lena D. Syrovy ,
Christian J. Willenborg ,
Eric N. Johnson  and
Steven J. Shirtliffe
Collen Redlick
Affiliation:
Graduate Student, Postdoctoral Fellow, Research Assistant, Assistant Professor, Research Assistant, and Professor, Department of Plant Sciences, College of Agriculture and Bioresources, University of Saskatchewan, 51 Campus Drive, Saskatoon, SK, S7N5A8
Hema S. N. Duddu*
Affiliation:
Graduate Student, Postdoctoral Fellow, Research Assistant, Assistant Professor, Research Assistant, and Professor, Department of Plant Sciences, College of Agriculture and Bioresources, University of Saskatchewan, 51 Campus Drive, Saskatoon, SK, S7N5A8
Lena D. Syrovy
Affiliation:
Graduate Student, Postdoctoral Fellow, Research Assistant, Assistant Professor, Research Assistant, and Professor, Department of Plant Sciences, College of Agriculture and Bioresources, University of Saskatchewan, 51 Campus Drive, Saskatoon, SK, S7N5A8
Christian J. Willenborg
Affiliation:
Graduate Student, Postdoctoral Fellow, Research Assistant, Assistant Professor, Research Assistant, and Professor, Department of Plant Sciences, College of Agriculture and Bioresources, University of Saskatchewan, 51 Campus Drive, Saskatoon, SK, S7N5A8
Eric N. Johnson
Affiliation:
Graduate Student, Postdoctoral Fellow, Research Assistant, Assistant Professor, Research Assistant, and Professor, Department of Plant Sciences, College of Agriculture and Bioresources, University of Saskatchewan, 51 Campus Drive, Saskatoon, SK, S7N5A8
Steven J. Shirtliffe
Affiliation:
Graduate Student, Postdoctoral Fellow, Research Assistant, Assistant Professor, Research Assistant, and Professor, Department of Plant Sciences, College of Agriculture and Bioresources, University of Saskatchewan, 51 Campus Drive, Saskatoon, SK, S7N5A8
*
*Corresponding author’s E-mail: hsn045@mail.usask.ca
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Abstract

Concern over the development of herbicide-resistant weeds has led to interest in integrated weed management systems that reduce selection pressure by utilizing mechanical and cultural weed control practices in addition to herbicides. Increasing crop seeding rate increases crop competitive ability and thus can enhance herbicide efficacy. However, it is unknown how increasing the seeding rate affects an herbicide’s efficacy. The objective of this study was to examine the interaction between increasing seeding rate and herbicide dose to control weeds. To meet this objective, the herbicide fluthiacet-methyl was applied to field-grown lentil, with Indian mustard, a proxy for wild mustard, used as a model weed. The experiment was a factorial design with four lentil seeding rates and seven herbicide rates. Overall the herbicide dose response was altered by changing lentil seeding rate. Increasing lentil seeding rate decreased the weed biomass production when herbicides were not applied. In two of the four site-years, increasing lentil seeding rate lowered the herbicide ED50, the dose required to result in a 50% reduction in weed biomass. Increasing the crop seeding rate altered the dose response to provide greater weed control at lower herbicide rates compared with normal crop seeding rates. Increased seeding rates also resulted in higher and more stable crop seed yields across a wider range of herbicide dosages. These results suggest that dose–response models can be used to evaluate the efficacy of other weed management practices that can interact with herbicide performance.

Keywords

Fluthiacet-methylIndian mustard, Brassica juncea (L.) Czern.wild mustard, Sinapis arvensis L., SINAlentil, Lens culinaris Medik.barley (Hordeum vulgare L.)canola (Brassica napus L.)Dose–response curveherbicide efficacyintegrated weed managementresistant weedseeding rate
Type
Weed Management
Information
Weed Science , Volume 65 , Issue 4 , July 2017 , pp. 525 - 533
Copyright
© Weed Science Society of America, 2017 

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Footnotes

Associate Editor for this paper: Adam Davis, USDA–ARS

References

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