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1 November 2001 Glyphosate-resistant horseweed from Delaware
Mark J. VanGessel
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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.

Nomenclature: Corn; Zea mays L.; horseweed; Conyza canadensis (L.) Cronq. ERICA; soybean; Glycine max (L.) Merr.; glyphosate.

Mark J. VanGessel "Glyphosate-resistant horseweed from Delaware," Weed Science 49(6), 703-705, (1 November 2001).[0703:RPRHFD]2.0.CO;2
Received: 17 July 2001; Accepted: 14 August 2001; Published: 1 November 2001
Glyphosate resistance
Herbicide resistance
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