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Variable Response of Common Waterhemp (Amaranthus rudis) Populations and Individuals to Glyphosate

Published online by Cambridge University Press:  20 January 2017

David A. Smith  and
Steven G. Hallett
David A. Smith
Affiliation:
Department of Botany and Plant Pathology, Purdue University, 915 West State Street, West Lafayette, IN 47907-1155
Steven G. Hallett*
Affiliation:
Department of Botany and Plant Pathology, Purdue University, 915 West State Street, West Lafayette, IN 47907-1155
*
Corresponding author's E-mail: [email protected]
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Abstract

Putatively resistant (PR) and putatively susceptible (PS) common waterhemp populations were grown in the greenhouse and sprayed at the three- to four-leaf stage with glyphosate (0.63 kg ae/ha). Surviving plants from PR populations and randomly selected plants from PS populations were clonally propagated and the clones were sprayed with 0.1 to 10.0 kg/ha glyphosate. The glyphosate rates required to reduce growth by 50% (GR50) among the clones were relatively similar, but the concentration required to reduce growth by 90% (GR90) ranged from 1.5 to 16.3 kg/ha. The concentration of glyphosate required to kill 90% of plants (LD90) ranged from 2.3 kg/ha to over 10.0 kg/ ha. This range of responses to glyphosate in common waterhemp clones from different parts of the Midwestern United States indicates a risk of evolution of resistance in common waterhemp populations that are repeatedly selected by applications of glyphosate in the field.

Keywords

Glyphosatecommon waterhemp, Amaranthus rudis Sauer # AMATADose responseherbicide resistanceherbicide toleranceGR50, the concentration of glyphosate required to reduce dry weights by 50%GR90, the concentration of glyphosate required to reduce dry weights by 90%LD90, the concentration of glyphosate required to kill 90% of plantsPR, putatively resistantPS, putatively susceptible
Type
Research Article
Information
Weed Technology , Volume 20 , Issue 2 , June 2006 , pp. 466 - 471
Copyright
Copyright © Weed Science Society of America 

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