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Benchmark Study: III. Survey on Changing Herbicide Use Patterns in Glyphosate-Resistant Cropping Systems

Published online by Cambridge University Press:  20 January 2017

Joby M. Prince
Affiliation:
Mississippi State University, Mississippi State, MS 39762
David R. Shaw*
Affiliation:
Mississippi State University, Mississippi State, MS 39762
Wade A. Givens
Affiliation:
Mississippi State University, Mississippi State, MS 39762
Michael E. Newman
Affiliation:
Mississippi State University, Mississippi State, MS 39762
Micheal D. K. Owen
Affiliation:
Iowa State University, Ames, IA 50011
Stephen C. Weller
Affiliation:
Purdue University, West Lafayette, IN 47907
Bryan G. Young
Affiliation:
Southern Illinois University, Carbondale, IL 62901
Robert G. Wilson
Affiliation:
University of Nebraska, Scotts Bluff, NE 69361
David L. Jordan
Affiliation:
North Carolina State University, Raleigh, NC 27695
*
Corresponding author's E-mail: dshaw@research.msstate.edu

Abstract

Approximately 1,300 growers from 22 states were surveyed during 2010 to determine herbicide use. Cropping systems included continuous glyphosate-resistant corn, cotton, and soybean, and various combinations of these crops and rotations with non–glyphosate-resistant crops. The most commonly used herbicide for both fall and spring applications was glyphosate followed by synthetic auxin herbicides. Herbicide application in spring was favored over application in the fall. The percentage of growers in a glyphosate-only system was as high as 69% for some cropping systems. Excluding glyphosate, the most frequently used herbicides included photosystem II, mitotic, and protoporphyrinogen oxidase inhibitors. A higher percentage of growers integrated herbicides other than glyphosate during 2010 compared with 2005. Extensive educational efforts have promoted resistance management by increasing the diversity of herbicides in glyphosate-resistant cropping systems. However, a considerable percentage of growers continued use of only glyphosate from the period of 2005 to 2010, and this practice most likely will continue to exert a high level of selection for evolved glyphosate-resistant weed species.

En 2010, aproximadamente 1,300 agricultores en 22 estados fueron encuestados, para determinar el uso de herbicidas. Los sistemas de cultivo incluyeron la siembra continua de maíz, algodón y soya resistentes al glifosato, así como también, varias combinaciones de estos cultivos y rotaciones con cultivos no resistentes al glifosato. El herbicida más comúnmente usado para las aplicaciones de otoño y primavera fue glifosato seguido por herbicidas auxinas sintéticas. La aplicación de herbicidas en primavera fue más frecuentemente usada que la aplicación en el otoño. El porcentaje de agricultores usando un sistema de solo glifosato fue tan alto como 69% para algunos sistemas de cultivo. Excluyendo al glifosato, los herbicidas más frecuentemente usados incluyeron fotosistema II, mitóticos e inhibidores de la protoporfirinogen oxidasa. Durante 2010 en comparación con 2005, un mayor porcentaje de agricultores integraron a sus sistemas otros herbicidas además del glifosato. Extensos esfuerzos educativos han promovido el manejo de resistencia al incrementarse la diversidad de herbicidas en los sistemas de cultivos resistentes al glifosato. Sin embargo, un porcentaje considerable de agricultores continuó usando solamente glifosato durante el período de 2005 a 2010, y ésta práctica muy probablemente continuará ejerciendo un alto nivel de selección de especies de malezas evolucionadas resistentes al glifosato.

Type
Education/Extension
Copyright
Copyright © Weed Science Society of America 

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