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Differential Kochia (Kochia scoparia) Populations Response to Glyphosate

Published online by Cambridge University Press:  20 January 2017

Jason Waite
Affiliation:
Department of Agronomy, Kansas State University, Manhattan KS 66506
Curtis R. Thompson
Affiliation:
Department of Agronomy, Kansas State University, Manhattan KS 66506
Dallas E. Peterson
Affiliation:
Department of Agronomy, Kansas State University, Manhattan KS 66506
Randall S. Currie
Affiliation:
Southwest Research Extension Center, Garden City, KS 67846
Brian L. S. Olson
Affiliation:
Northwest Area Extension Office, Colby KS 67701
Phillip W. Stahlman
Affiliation:
Agricultural Research Center, Hays, KS 67601
Kassim Al-Khatib*
Affiliation:
Plant Sciences Department, University of California, Davis, CA 95616
*
Corresponding Author E-mail: kalkhatib@ucdavis.edu

Abstract

Kochia is a troublesome weed throughout the western United States. Although glyphosate effectively controls kochia, poor control was observed in several no-till fields in Kansas. The objectives of this research were to evaluate kochia populations response to glyphosate and examine the mechanism that causes differential response to glyphosate. Glyphosate was applied at 0, 54, 109, 218, 435, 870, 1305, 1740, 3480, and 5220 g ae ha−1 on 10 kochia populations. In general, kochia populations differed in their response to glyphosate. At 21 d after treatment, injury from glyphosate applied at 870 g ha−1 range from 4 to 91%. In addition, glyphosate rate required to cause 50% visible injury (GR50) ranged from 470 to 2149 g ha−1. Differences in glyphosate absorption and translocation and kochia mineral content were not sufficient to explain differential kochia response to glyphosate.

Type
Physiology, Chemistry, and Biochemistry
Copyright
Copyright © Weed Science Society of America 

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