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Glyphosate-resistant horseweed from Delaware

Published online by Cambridge University Press:  20 January 2017

Mark J. VanGessel
Mark J. VanGessel*
Affiliation:
Department of Plant and Soil Sciences, University of Delaware, Research and Education Center, 16684 County Seat Highway, Georgetown, DE 19947; mjv@udel.edu
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Abstract

No-tillage corn (Zea mays L.) and soybean [Glycine max (L.) Merr.] production has been widely accepted in the mid-Atlantic region, favoring establishment of horseweed [Conyza canadensis (L.) Cronq.]. Within 3 yr of using only glyphosate for weed control in continuous glyphosate-resistant soybeans, glyphosate failed to control horseweed in some fields. Seedlings originating from seed of one population collected in Delaware were grown in the greenhouse and exhibited 8- to 13-fold glyphosate resistance compared with a susceptible population. There were no differences between the isopropylamine or diammonium salts of glyphosate.

Keywords

CornZea mays L.horseweedConyza canadensis (L.) Cronq. ERICAsoybeanGlycine max (L.) Merr.glyphosateHerbicide resistanceglyphosate resistance
Type
Rapid Publication
Information
Weed Science , Volume 49 , Issue 6 , December 2001 , pp. 703 - 705
Copyright
Copyright © Weed Science Society of America 

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