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Glyphosate-Resistant Weeds and Resistance Management Strategies: An Indiana Grower Perspective

Published online by Cambridge University Press:  20 January 2017

William G. Johnson  and
Kevin D. Gibson
William G. Johnson*
Affiliation:
Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN 47907
Kevin D. Gibson
Affiliation:
Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN 47907
*
Corresponding author's E-mail: [email protected]
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Abstract

Corn and soybean growers across Indiana were surveyed during winter 2003/2004 to assess their perceptions about the importance of glyphosate-resistant weeds and management tactics to prevent development of resistant populations. The survey showed two intriguing observations. First, 65% of survey respondents expressed moderate or low levels of concern about weeds developing resistance to glyphosate, whereas 36% expressed a high level of concern. Second, when asked an open-ended question regarding the factors that contribute to development of glyphosate-resistant weeds, 58% of the responses included repeated use of the same mode of action. Other factors such as poor application techniques or timing (33%), unique weed characteristics (8%) and changes in tillage practices (1%) were also mentioned. The survey showed that even though a relatively low percentage of respondents were highly concerned about resistance, they still expressed a willingness to use field scouting, tank-mix partners with glyphosate for burn-down and postemergence weed control, and soil-applied residual herbicides as resistance management strategies. This survey also showed that growers who farm 800 ha or more were more concerned about glyphosate resistance and more likely to adopt resistance management strategies than smaller growers.

Keywords

Glyphosatecorn, Zea mayssoybean, Glycine max (L.) MerrSurveyGRglyphosate-resistant
Type
Research Article
Information
Weed Technology , Volume 20 , Issue 3 , September 2006 , pp. 768 - 772
Copyright
Copyright © Weed Science Society of America 

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