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Effect of Time of Day of Application of 2,4-D, Dicamba, Glufosinate, Paraquat, and Saflufenacil on Horseweed (Conyza canadensis) Control

Published online by Cambridge University Press:  24 August 2017

Garret B. Montgomery ,
Joyce A. Treadway ,
Julie L. Reeves  and
Lawrence E. Steckel
Garret B. Montgomery*
Affiliation:
Graduate Research Assistant, Research Associate, and Professor, Department of Plant Sciences, University of Tennessee, 605 Airways Boulevard, Jackson, TN 38301
Joyce A. Treadway
Affiliation:
Assistant Professor, Department of Crop, Soil, and Environmental Sciences, Auburn University, 201 Funchess Hall, Auburn, AL 36849
Julie L. Reeves
Affiliation:
Graduate Research Assistant, Research Associate, and Professor, Department of Plant Sciences, University of Tennessee, 605 Airways Boulevard, Jackson, TN 38301
Lawrence E. Steckel
Affiliation:
Graduate Research Assistant, Research Associate, and Professor, Department of Plant Sciences, University of Tennessee, 605 Airways Boulevard, Jackson, TN 38301
*
*Corresponding author’s E-mail:garbmont@vols.utk.edu
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Abstract

A study to evaluate the effect of application time of day (TOD) on the efficacy of five burndown herbicides was conducted in Alabama and Tennessee. Treatments of 2,4-D, dicamba, glufosinate, paraquat, and saflufenacil were applied at sunrise, midday, or sunset to a native population of horseweed and analyzed separately. Control of glyphosate-resistant (GR) horseweed with 2,4-D, dicamba, glufosinate, and saflufenacil was greatest from the midday application. Percentage of living horseweed counts for all of these herbicides followed a similar pattern. Control from paraquat was lowest at the midday timing and greatest from the sunset application with surviving horseweed plant populations reflecting those control ratings. Application TOD significantly affected all of the herbicides in this research. Applications of 2,4-D, dicamba, glufosinate, and saflufenacil are more efficacious when applied during the middle portion of the day, while paraquat is more efficacious when applied at sunset for maximum horseweed control.

Keywords

2,4-Ddicambaglufosinateparaquatsaflufenacilhorseweed, Conyza canadensis (L.) Cronq.Application technologyapplication time of daycultural weed control
Type
Weed Management-Major Crops
Information
Weed Technology , Volume 31 , Issue 4 , August 2017 , pp. 550 - 556
Copyright
© Weed Science Society of America, 2017 

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Footnotes

Associate Editor for this paper: Robert Nurse, Agriculture and Agri-Food Canada.

References

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