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Influence of time of day on dicamba and glyphosate efficacy

Published online by Cambridge University Press:  13 August 2021

Jacob R. Kalina
Affiliation:
Graduate Research Assistant, University of Georgia, Department of Crop and Soil Sciences, Tifton, GA, USA
Chris B. Corkern
Affiliation:
Technology Development Representative, Bayer Crop Sciences, Alapaha, GA, USA
Donn G. Shilling
Affiliation:
Professor, University of Georgia, Department of Crop and Soil Sciences, Athens, GA, USA
Nicholas T. Basinger*
Affiliation:
Assistant Professor, University of Georgia, Department of Crop and Soil Sciences, Athens, GA, USA
Timothy L. Grey
Affiliation:
Professor, University of Georgia, Department of Crop and Soil Sciences, Tifton, GA, USA
*
Author for correspondence: Nicholas T. Basinger, University of Georgia, 4103 Miller Plant Sciences, 120 Carleton Street, Athens, GA 30602. Email: nicholas.basinger@uga.edu

Abstract

Renewed interest in studying auxin herbicides (WSSA Group 4) is increasing as a result of the release of genetically engineered crop varieties that are tolerant to preemergence and postemergence applications of specific formulations of dicamba. Auxin-resistant crops were developed in response to the development of weed species resistant to glyphosate and other herbicides. Research was conducted at multiple field locations in Georgia in 2018 and 2019 to examine weed control when postemergence herbicides were applied to dicamba- and glyphosate-resistant cotton at eight different points in time over a 24-h period. Applications were made at 1 h prior to sunrise all the way up to midnight during the same day to examine the effect of herbicide application timing on broadleaf weed control. Glyphosate, dicamba, and glyphosate plus dicamba were applied at each timing. Visual ratings of weed control were scored at 7, 14, 21, and 28 d after treatment (DAT). Weed control was affected by herbicide application timing. Midnight applications resulted in the lowest levels of control. Sicklepod, pitted morningglory, and prickly sida control was 49%, 38%, and 41%, respectively. Greatest control of all three species (up to 99%) occurred from the noon to 1 h prior to sunset application timings. Orthogonal contrasts of timing of application indicated that weed control was improved with day > night and pre-dawn > midnight.

Type
Research Article
Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of the Weed Science Society of America

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Footnotes

Associate Editor: William Johnson, Purdue University

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