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Influence of Glyphosate-Resistant Horseweed (Conyza canadensis) Growth Stage on Response to Glyphosate Applications

Published online by Cambridge University Press:  20 January 2017

Mark J. VanGessel ,
Barbara A. Scott ,
Quintin R. Johnson  and
Susan E. White-Hansen
Mark J. VanGessel*
Affiliation:
Department of Plant and Soil Sciences, University of Delaware, Research and Education Center, 16483 County Seat Highway, Georgetown, DE 19947
Barbara A. Scott
Affiliation:
Department of Plant and Soil Sciences, University of Delaware, Research and Education Center, 16483 County Seat Highway, Georgetown, DE 19947
Quintin R. Johnson
Affiliation:
Department of Plant and Soil Sciences, University of Delaware, Research and Education Center, 16483 County Seat Highway, Georgetown, DE 19947
Susan E. White-Hansen
Affiliation:
Department of Plant and Soil Sciences, University of Delaware, Research and Education Center, 16483 County Seat Highway, Georgetown, DE 19947
*
Corresponding author's E-mail: mjv@udel.edu.
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Abstract

Infestations of glyphosate-resistant (GR) horseweed have become widespread in the eastern United States. This biotype is problematic in no-tillage production that relies extensively on glyphosate for weed control. Because horseweed is treated at various stages of growth, a greenhouse study explored rate response of glyphosate-resistant and -susceptible horseweed at three growth stages. GR horseweed was more responsive to glyphosate at the seedling stage than at the large rosette or bolting stages. A field study evaluated GR horseweed response when treated with glyphosate at soybean planting time, POST in-crop (about 45 d after planting), or both at planting and POST in-crop. There was a cumulative effect of the at-planting followed by POST in-crop glyphosate applications. When evaluating single glyphosate applications, the at-planting application was more effective at suppressing GR horseweed than a POST in-crop application. Because glyphosate cannot control GR horseweed, this biotype should be controlled with an herbicide with an alternate mode of action and applied at the most effective timing.

Keywords

Glyphosatehorseweed, Conyza canadensis (L.) Cronq.soybean, Glycine max (L.) MerrGlyphosate resistanceherbicide resistance
Type
Weed Management—Major Crops
Information
Weed Technology , Volume 23 , Issue 1 , March 2009 , pp. 49 - 53
Copyright
Copyright © Weed Science Society of America 

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