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Dicamba-Tolerant Soybean Combined Cover Crop to Control Palmer amaranth

  • Garret B. Montgomery (a1), Angela T. McClure (a2), Robert M. Hayes (a3), Forbes R. Walker (a4), Scott A. Senseman (a5) and Lawrence E. Steckel (a3)...
  • Please note a correction has been issued for this article.

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.

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Corresponding author

Author for correspondence: Lawrence E. Steckel, Department of Plant Sciences, University of Tennessee, Jackson, TN 38301. (E-mail: lsteckel@utk.edu)

References

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