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Sweetpotato response to reduced rates of dicamba

Published online by Cambridge University Press:  11 August 2021

Mark W. Shankle Open the ORCID record for Mark W. Shankle [Opens in a new window] ,
Lorin M. Harvey Open the ORCID record for Lorin M. Harvey [Opens in a new window] ,
Stephen L. Meyers Open the ORCID record for Stephen L. Meyers [Opens in a new window]  and
Callie J. Morris Open the ORCID record for Callie J. Morris [Opens in a new window]
Mark W. Shankle*
Affiliation:
Research Professor, North Mississippi Research and Extension Center- Pontotoc Ridge–Flatwoods Branch Experiment Station, Mississippi State University, Pontotoc, MS, USA
Lorin M. Harvey
Affiliation:
Assistant Professor, North Mississippi Research and Extension Center- Pontotoc Ridge–Flatwoods Branch Experiment Station, Mississippi State University, Pontotoc, MS, USA
Stephen L. Meyers
Affiliation:
Assistant Professor, Department of Horticulture and Landscape Architecture, Purdue University, West Lafayette, IN, USA
Callie J. Morris
Affiliation:
Research Associate, North Mississippi Research and Extension Center- Pontotoc Ridge–Flatwoods Branch Experiment Station, Mississippi State University, Pontotoc, MS, USA
*
Author for Correspondence: Mark W. Shankle, North Mississippi Research and Extension Center- Pontotoc Ridge–Flatwoods Branch Experiment Station, Mississippi State University, Pontotoc, MS38863 Email: [email protected]
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Abstract

A field study was conducted in Mississippi to determine the effect of reduced dicamba rates on sweetpotato crop tolerance and storage root yield, simulating off-target movement or sprayer tank contamination. Treatments included a nontreated control and four rates of dicamba [70 g ae ha−1 (1/8×), 35 g ae ha−1 (1/16×), 8.65 g ae ha−1 (1/64×), and 1.09 g ae ha−1 (1/512×)] applied either 3 d before transplanting (DBP) or 1, 3, 5, or 7 wk after transplanting (WAP). An additional treatment consisted of 560 g ae ha−1 (1×) dicamba applied 3 DBP. Crop injury ratings were taken 1, 2, 3, and 4 wk after treatment (WAT). Across application timings, predicted sweetpotato plant injury 1, 2, 3, and 4 WAT increased from 3T to 22%, 3% to 32%, 2% to 58%, and 1% to 64% as dicamba rate increased from 0 to 70 g ha−1 (1/8×), respectively. As dicamba rate increased from 1/512× to 1/8×, predicted No. 1 yield decreased from 127% to 55%, 103% to 69%, 124% to 31%, and 124% to 41% of the nontreated control for applications made 1, 3, 5, and 7 WAP, respectively. Similarly, as dicamba rate increased from 1/512× to 1/8×, predicted marketable yield decreased from 123% to 57%, 107% to 77%, 121% to 44%, and 110% to 53% of the nontreated control for applications made 1, 3, 5, and 7 WAP, respectively. Dicamba residue (5.3 to 14.3 parts per billion) was detected in roots treated with 1/16× or 1/8× dicamba applied 5 or 7 WAP and 1/64× dicamba applied 7 WAP with the highest residue detected in roots harvested from sweetpotato plants treated at 7 WAP. Collectively, care should be taken to avoid sweetpotato exposure to dicamba especially at 1/8× and 1/16× rates during the growing season.

Keywords

DicambasweetpotatoIpomoea batatas (L.) Lam. ‘Beauregard’Crop injurycrop toleranceyield loss
Type
Research Article
Information
Weed Technology , Volume 35 , Issue 5 , October 2021 , pp. 748 - 752
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Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of the Weed Science Society

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Footnotes

Associate Editor: Peter J. Dittmar, University of Florida

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