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Control of Volunteer Glyphosate-Resistant Corn (Zea mays) in Glyphosate-Resistant Soybean (Glycine max)

Published online by Cambridge University Press:  20 January 2017

William Deen ,
Allan Hamill ,
Christy Shropshire ,
Nader Soltani  and
Peter H. Sikkema
William Deen*
Affiliation:
Department of Plant Agriculture, University of Guelph, Guelph, ON N1G 2W1, Canada
Allan Hamill
Affiliation:
Agriculture and Agri-Food Canada, Harrow, ON N0R 1G0, Canada
Christy Shropshire
Affiliation:
Ridgetown College, University of Guelph, Ridgetown, ON N0P 2C0, Canada
Nader Soltani
Affiliation:
Ridgetown College, University of Guelph, Ridgetown, ON N0P 2C0, Canada
Peter H. Sikkema
Affiliation:
Ridgetown College, University of Guelph, Ridgetown, ON N0P 2C0, Canada
*
Corresponding author's E-mail: bdeen@uoguelph.ca
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Abstract

Volunteer corn in soybean can reduce yields, interfere with harvest, and cause unacceptable levels of contamination by its presence in the harvested soybean. In Ontario, soybean frequently follow corn in rotation. The use of glyphosate-resistant corn and soybean varieties has increased dramatically in Ontario. Field studies were conducted at two locations in southwestern Ontario to determine whether quizalofop-p-ethyl, clethodim, and fenoxaprop-p-ethyl can be tank mixed with glyphosate to provide effective control of volunteer glyphosate-resistant corn in glyphosate-resistant soybean. Soybean plots were overseeded with glyphosate-resistant corn and treatments consisting of glyphosate applied alone and tank mixed with full and reduced rates of each graminicide with and without a recommended surfactant. Tank mixing the graminicides and adjuvants with glyphosate did not affect glyphosate weed control or crop tolerance. Use of a recommended adjuvant significantly improved the effectiveness of the graminicides, particularly when reduced rates were applied. Quizalofop-p-ethyl was the most effective graminicide for controlling glyphosate-resistant volunteer corn, followed by clethodim and fenoxaprop-p-ethyl.

Keywords

Soybean, Glycine max (L.) Merr. ‘Pioneer 9294 RR’volunteer corn, Zea mays L.GraminicidesefficacyDATdays after treatment
Type
Research Article
Information
Weed Technology , Volume 20 , Issue 1 , March 2006 , pp. 261 - 266
Copyright
Copyright © Weed Science Society of America 

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References

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