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Herbicide systems including linuron for Palmer amaranth (Amaranthus palmeri) control in sweetpotato

Published online by Cambridge University Press:  16 June 2020

Levi D. Moore Open the ORCID record for Levi D. Moore [Opens in a new window] ,
Katherine M. Jennings ,
David W. Monks ,
Michael D. Boyette ,
David L. Jordan  and
Ramon G. Leon
Levi D. Moore*
Affiliation:
Graduate Student, Department of Horticultural Science, North Carolina State University, Raleigh, NC, USA
Katherine M. Jennings
Affiliation:
Associate Professor, Department of Horticultural Science, North Carolina State University, Raleigh, NC, USA
David W. Monks
Affiliation:
Professor, Department of Horticultural Science, North Carolina State University, Raleigh, NC, USA
Michael D. Boyette
Affiliation:
Professor, Department of Biological and Agricultural Engineering, North Carolina State University, Raleigh, NC, USA
David L. Jordan
Affiliation:
Professor, Department of Crop and Soil Sciences, North Carolina State University, Raleigh, NC, USA
Ramon G. Leon
Affiliation:
Associate Professor, Department of Crop and Soil Sciences, North Carolina State University, Raleigh, NC, USA
*
Author for correspondence: Levi D. Moore, Graduate Student, Department of Horticultural Science, North Carolina State University, 2721 Founders Drive, Raleigh, NC27965. Email: [email protected]
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Abstract

Field studies were conducted to determine sweetpotato tolerance to and weed control from management systems that included linuron. Treatments included flumioxazin preplant (107 g ai ha−1) followed by (fb) S-metolachlor (800 g ai ha−1), oryzalin (840 g ai ha−1), or linuron (280, 420, 560, 700, and 840 g ai ha−1) alone or mixed with S-metolachlor or oryzalin applied 7 d after transplanting. Weeds did not emerge before the treatment applications. Two of the four field studies were maintained weed-free throughout the season to evaluate sweetpotato tolerance without weed interference. The herbicide program with the greatest sweetpotato yield was flumioxazin fb S-metolachlor. Mixing linuron with S-metolachlor did not improve Palmer amaranth management and decreased marketable yield by up to 28% compared with flumioxazin fb S-metolachlor. Thus, linuron should not be applied POST in sweetpotato if Palmer amaranth has not emerged at the time of application.

Keywords

FlumioxazinlinuronoryzalinS-metolachlorPalmer amaranth, Amaranthus palmeri S. Watson AMAPAWeed controlherbicide tillageherbicide cultivation
Type
Research Article
Information
Weed Technology , Volume 35 , Issue 1 , February 2021 , pp. 49 - 56
Copyright
© Weed Science Society of America, 2020

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Footnotes

Associate Editor: Darren Robinson, University of Guelph

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