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Efficacy of residual herbicides influenced by cover-crop residue for control of Amaranthus palmeri and A. tuberculatus in soybean

  • Clay M. Perkins (a1), Karla L. Gage (a2), Jason K. Norsworthy (a3), Bryan G. Young (a4), Kevin W. Bradley (a5), Mandy D. Bish (a6), Aaron Hager (a7) and Lawrence E. Steckel (a8)...

Abstract

Field studies were conducted in 2018 and 2019 in Arkansas, Indiana, Illinois, Missouri, and Tennessee to determine if cover-crop residue interfered with herbicides that provide residual control of Palmer amaranth and waterhemp in no-till soybean. The experiments were established in the fall with planting of cover crops (cereal rye + hairy vetch). Herbicide treatments consisted of a nontreated or no residual, acetochlor, dimethenamid-P, flumioxazin, pyroxasulfone + flumioxazin, pendimethalin, metribuzin, pyroxasulfone, and S-metolachlor. Palmer amaranth took 18 d and waterhemp took 24 d in the cover crop–alone (nontreated) treatment to reach a height of 10 cm. Compared with this treatment, all herbicides except metribuzin increased the number of days until 10-cm Palmer amaranth was present. Flumioxazin applied alone or in a mixture with pyroxasulfone were the best at delaying Palmer amaranth growing to a height of 10 cm (35 d and 33 d, respectively). The herbicides that resulted in the lowest Palmer amaranth density (1.5 to 4 times less) integrated with a cover crop were pyroxasulfone + flumioxazin, flumioxazin, pyroxasulfone, and acetochlor. Those four herbicide treatments also delayed Palmer amaranth emergence for the longest period (27 to 34 d). Waterhemp density was 7 to 14 times less with acetochlor than all the other herbicides present. Yield differences were observed for locations with waterhemp. This research supports previous research indicating that utilizing soil-residual herbicides along with cover crops improves control of Palmer amaranth and/or waterhemp.

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Copyright

This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.

Corresponding author

Author for correspondence: Lawrence E. Steckel, Department of Plant Science, University of Tennessee, West TN Research and Education Center, 605 Airways Boulevard, Jackson, TN38301 Email: lsteckel@utk.edu

Footnotes

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Associate Editor: Amit Jhala, University of Nebraska, Lincoln

Footnotes

References

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Keywords

Efficacy of residual herbicides influenced by cover-crop residue for control of Amaranthus palmeri and A. tuberculatus in soybean

  • Clay M. Perkins (a1), Karla L. Gage (a2), Jason K. Norsworthy (a3), Bryan G. Young (a4), Kevin W. Bradley (a5), Mandy D. Bish (a6), Aaron Hager (a7) and Lawrence E. Steckel (a8)...

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