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Corn Yield Loss Due to Volunteer Soybean

Published online by Cambridge University Press:  20 January 2017

Jill Alms ,
Sharon A. Clay ,
David Vos  and
Michael Moechnig
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: [email protected]
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Abstract

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The widespread adoption of glyphosate-resistant corn and soybean in cropping rotations often results in volunteer plants from the previous season becoming problem weeds that require alternative herbicides for control. Corn yield losses due to season-long volunteer soybean competition at several densities in two growing seasons were used to define a hyperbolic yield loss function. The maximum corn yield loss observed at high volunteer soybean densities was about 56%, whereas, the incremental yield loss (I) at low densities was 3.2%. Corn yield loss at low volunteer soybean densities was similar to losses reported for low densities of velvetleaf and redroot pigweed, with 10% yield loss estimated to occur at 3 to 4 volunteer soybean plants m−2. Several herbicides, including dicamba with or without diflufenzopyr applied at the V2 growth stage of volunteer soybean, provided > 90% control, demonstrating several economical options to control volunteer glyphosate-resistant soybean in glyphosate-resistant corn. Reevaluation of control recommendations may be needed with commercialization of other genetically modified herbicide-resistant soybean varieties.

Keywords

Corn, Zea mays L.soybean, Glycine max (L.) Merr.redroot pigweed, Amaranthus retroflexus L.velvetleaf, Abutilon theophrasti MedikCompetitionweed-crop interactions
Type
Weed Biology and Ecology
Information
Weed Science , Volume 64 , Issue 3 , September 2016 , pp. 495 - 500
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

Footnotes

Associate Editor for this paper: John L. Lindquist, University of Nebraska.

References

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