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U.S. Grower Views on Problematic Weeds and Changes in Weed Pressure in Glyphosate-Resistant Corn, Cotton, and Soybean Cropping Systems

Published online by Cambridge University Press:  20 January 2017

Greg R. Kruger ,
William G. Johnson ,
Stephen C. Weller ,
Micheal D. K. Owen ,
David R. Shaw ,
John W. Wilcut ,
David L. Jordan ,
Robert G. Wilson ,
Mark L. Bernards  and
Bryan G. Young
Greg R. Kruger
Affiliation:
Purdue University, West Lafayette, IN 47907
William G. Johnson*
Affiliation:
Purdue University, West Lafayette, IN 47907
Stephen C. Weller
Affiliation:
Purdue University, West Lafayette, IN 47907
Micheal D. K. Owen
Affiliation:
Iowa State University, Ames, IA
David R. Shaw
Affiliation:
Mississippi State University, Mississippi State, MS
John W. Wilcut
Affiliation:
North Carolina State University, Raleigh, NC
David L. Jordan
Affiliation:
North Carolina State University, Raleigh, NC
Robert G. Wilson
Affiliation:
University of Nebraska, Scottsbluff, NE
Mark L. Bernards
Affiliation:
University of Nebraska, Scottsbluff, NE
Bryan G. Young
Affiliation:
Southern Illinois University, Carbondale, IL
*
Corresponding author's E-mail: wgj@purdue.edu.
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Abstract

Corn and soybean growers in Illinois, Indiana, Iowa, Mississippi, Nebraska, and North Carolina, as well as cotton growers in Mississippi and North Carolina, were surveyed about their views on changes in problematic weeds and weed pressure in cropping systems based on a glyphosate-resistant (GR) crop. No growers using a GR cropping system for more than 5 yr reported heavy weed pressure. Over all cropping systems investigated (continuous GR soybean, continuous GR cotton, GR corn/GR soybean, GR soybean/non-GR crop, and GR corn/non-GR crop), 0 to 7% of survey respondents reported greater weed pressure after implementing rotations using GR crops, whereas 31 to 57% felt weed pressure was similar and 36 to 70% indicated that weed pressure was less. Pigweed, morningglory, johnsongrass, ragweed, foxtail, and velvetleaf were mentioned as their most problematic weeds, depending on the state and cropping system. Systems using GR crops improved weed management compared with the technologies used before the adoption of GR crops. However, the long-term success of managing problematic weeds in GR cropping systems will require the development of multifaceted integrated weed management programs that include glyphosate as well as other weed management tactics.

Keywords

Glyphosatefoxtail, Setaria spp.johnsongrass, Sorghum halepense (L.) Pers.morningglory, Ipomoea spp.pigweed, Amaranthus spp.ragweed, Ambrosia spp.velvetleaf, Abutilon theophrasti Medik.corn, Zea mays L.cotton, Gossypium hirsutum Lsoybean, Glycine max (L.) MerrCrop rotationglyphosate-resistant cropsglyphosate-resistant weedssurveyweed shifts
Type
Education/Extension
Information
Weed Technology , Volume 23 , Issue 1 , March 2009 , pp. 162 - 166
Copyright
Copyright © Weed Science Society of America 

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