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Corn Yield Loss Due to Volunteer Soybean

Published online by Cambridge University Press:  20 January 2017

Jill Alms
Affiliation:
Plant Science Dept., South Dakota State University, Brookings, SD
Sharon A. Clay*
Affiliation:
Plant Science Dept. South Dakota State University, Brookings, SD
David Vos
Affiliation:
Plant Science Dept., South Dakota State University, Brookings, SD
Michael Moechnig
Affiliation:
Dow AgroSciences, Indianapolis, IN
*
Corresponding author's E-mail: sharon.clay@sdstate.edu
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Abstract

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The widespread adoption of glyphosate-resistant corn and soybean in croppingrotations often results in volunteer plants from the previous seasonbecoming problem weeds that require alternative herbicides for control. Cornyield losses due to season-long volunteer soybean competition at severaldensities in two growing seasons were used to define a hyperbolic yield lossfunction. The maximum corn yield loss observed at high volunteer soybeandensities was about 56%, whereas, the incremental yield loss (I) at low densities was 3.2%. Corn yield loss at lowvolunteer soybean densities was similar to losses reported for low densitiesof velvetleaf and redroot pigweed, with 10% yield loss estimated to occur at3 to 4 volunteer soybean plants m−2. Several herbicides,including dicamba with or without diflufenzopyr applied at the V2 growthstage of volunteer soybean, provided > 90% control, demonstrating severaleconomical options to control volunteer glyphosate-resistant soybean inglyphosate-resistant corn. Reevaluation of control recommendations may beneeded with commercialization of other genetically modifiedherbicide-resistant soybean varieties.

Information

Type
Weed Biology and Ecology
Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution license (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.
Copyright
Copyright © Weed Science Society of America