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Dicamba-Tolerant Soybean Combined Cover Crop to Control Palmer amaranth

Published online by Cambridge University Press:  20 November 2017

Garret B. Montgomery ,
Angela T. McClure ,
Robert M. Hayes ,
Forbes R. Walker ,
Scott A. Senseman  and
Lawrence E. Steckel
Garret B. Montgomery
Affiliation:
Graduate Research Assistant, Department of Plant Sciences, University of Tennessee, Jackson, TN, USA
Angela T. McClure
Affiliation:
Associate Professor, Department of Plant Sciences, University of Tennessee, Jackson, TN, USA
Robert M. Hayes
Affiliation:
Professor, Department of Plant Sciences, University of Tennessee, Jackson, TN, USA
Forbes R. Walker
Affiliation:
Associate Professor, Department of Biosystems Engineering and Soil Science, 2506 E.J. Chapman Dr., Knoxville, TN, USA
Scott A. Senseman
Affiliation:
Professor and Head of Department of Plant Sciences, University of Tennessee, Knoxville, TN, USA
Lawrence E. Steckel*
Affiliation:
Professor, Department of Plant Sciences, University of Tennessee, Jackson, TN, USA
*
Author for correspondence: Lawrence E. Steckel, Department of Plant Sciences, University of Tennessee, Jackson, TN 38301. (E-mail: lsteckel@utk.edu)
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Abstract

A study was conducted to evaluate the response of glyphosate- and dicamba-tolerant (GDT) soybean and weed control from cover crop different termination intervals before and after soybean planting. Cover crop biomass was highest when terminated at planting, decreased with the 7- and 14-d preplant (DPP) and day-after-planting (DAP) timings, and again at the 14 DPP and DAP timings. Glyphosate+dicamba provided total control of cover crops by 21 DAP. Cover crop termination timing did not influence soybean population or yield. Palmer amaranth control at the 21 and 28 d after termination (DAT) was 97% to 99%. Differences in Palmer amaranth control were not detected among herbicide programs or termination intervals at the end of season rating, and all treatments provided ≥97% control. Although differences in Palmer amaranth control were not apparent at the end of the season, the delay in cover crop affected the number of days until 10-cm Palmer amaranth was present. When utilizing a wheat+hairy vetch cover crop in DGT soybeans, producers should delay cover crop termination until 11 to 14 DPP and make at least one POST application of glyphosate+dicamba+an additional herbicide mode of action (MOA) to maximize Palmer amaranth control and soybean yields.

Keywords

Kevin Bradley, University of MissouriGlyphosatedicambafomesafenPalmer amaranth, Amaranthus palmeri (S.) Wats.hairy vetch, Vicia villosa Roth.wheat, Triticum aestivum L.soybean, Glycine max (L.) Merr.Cover cropscultural weed controlresistance management
Type
Weed Management-Major Crops
Information
Weed Technology , Volume 32 , Issue 2 , April 2018 , pp. 109 - 115
Copyright
© Weed Science Society of America, 2017 

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