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Characterization of carinata tolerance to select herbicides using field dose-response studies

Published online by Cambridge University Press:  12 July 2021

Sandra R. Ethridge ,
Angela Post ,
Pratap Devkota ,
Michael J. Mulvaney  and
Ramon G. Leon Open the ORCID record for Ramon G. Leon [Opens in a new window]
Sandra R. Ethridge
Affiliation:
Graduate Student, Department of Crop and Soil Sciences, North Carolina State University, Raleigh, NC, USA
Angela Post
Affiliation:
Assistant Professor, Department of Crop and Soil Sciences, North Carolina State University, Raleigh, NC, USA
Pratap Devkota
Affiliation:
Assistant Professor, West Florida Research and Education Center, University of Florida, Jay, FL, USA
Michael J. Mulvaney
Affiliation:
Assistant Professor, West Florida Research and Education Center, University of Florida, Jay, FL, USA
Ramon G. Leon*
Affiliation:
Associate Professor, Department of Crop and Soil Sciences, Center for Environmental Farming Systems, Genetic Engineering and Society Center, North Carolina State University, Raleigh, NC, USA
*
Author for correspondence: Ramon G. Leon, 4402C Williams Hall, North Carolina State University, Raleigh, NC27695. Email: [email protected]
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Abstract

Field experiments were conducted from 2017 to 2019 to determine the tolerance of carinata to several preemergence and postemergence herbicides. Preliminary screenings identified herbicides that caused large variation on carinata injury, indicating the potential for selectivity. Dose-response field studies were conducted to quantify the tolerance of carinata to select herbicides. Diuron applied preemergence at rates of 280 g ai ha−1 or higher reduced carinata population density 54% to 84% compared to the nontreated control. In certain locations, clomazone applied preemergence caused minor injury with an acceptable level of carinata tolerance and only doses above 105 g ai ha−1 caused yield reductions. Napropamide doses of 2,856 g ai ha−1 or higher applied preemergence caused at least 25% injury to carinata; however, the damage was not severe enough to reduce yields. Simazine applied postemergence at rates above 1,594 g ai ha−1 caused 50% or more injury, resulting in yield losses ranging from 0% to 95% depending on location. Clopyralid applied postemergence at 2,512 g ai ha−1 caused 25% injury with relative yield reductions, which varied across locations. The present study identified clomazone and napropamide applied preemergence, and clopyralid applied postemergence as potential herbicides for weed control in carinata. In contrast, diuron, simazine, metribuzin, imazethapyr, and chlorimuron caused high levels of carinata mortality and can be used to control volunteer carinata plants in rotational crops.

Keywords

chlorimuronclomazoneclopyraliddiuronimazethapyrnapropamidesimazinecarinata, Brassica carinata A. BraunCrop rotationcrop toleranceherbicide selectivityintegrated weed managementvolunteer crop control
Type
Research Article
Information
Weed Technology , Volume 35 , Issue 6 , December 2021 , pp. 957 - 966
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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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