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Glyphosate-resistant horseweed from Delaware

Published online by Cambridge University Press:  20 January 2017

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

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.

Type
Rapid Publication
Copyright
Copyright © Weed Science Society of America 

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