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Control of Sulfonylurea-Resistant Kochia (Kochia scoparia)

Published online by Cambridge University Press:  12 June 2017

Dennis J. Tonks  and
Philip Westra
Dennis J. Tonks
Affiliation:
Department of Bioagricultural Sciences and Pest Management. Colorado State University, Fort Collins, CO 80523-1174
Philip Westra
Affiliation:
Department of Bioagricultural Sciences and Pest Management. Colorado State University, Fort Collins, CO 80523-1174
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Abstract

Greenhouse and field experiments were conducted to assess the effectiveness of herbicide tank mixtures for control of sulfonylurea (SU)-resistant and -susceptible kochia biotypes. Kochia control at three growth stages was evaluated for fluroxypyr, dicamba, 2,4-D, bromoxynil, and bromoxynil plus MCPA. Control decreased as kochia size increased, especially at less than full labeled herbicide rates. Treatments containing bromoxynil provided best overall control in the greenhouse but were less effective on larger kochia plants in the field. Dicamba and fluroxypyr provided similar, effective kochia control both in greenhouse and field experiments. 2,4-D did not provide acceptable kochia control regardless of formulation, rate, or application timing. All kochia biotypes responded similarly to non-SU herbicides. In the field, inclusion of an SU herbicide in the treatment generally resulted in no increased R-kochia control above that provided by the non-SU herbicide. R-kochia population dynamics can affect selection of alternative control strategies.

Keywords

Bromoxynil, 3,5-dibromo-4-hydroxybenzonitriledicamba, 3,6-dichloro-2-methoxybenzoic acidfluroxypyr, [(4-amino-3,5-dichloro-6-fluoro-3-pyridinyl)oxy]acetic acidMCPA, (4-chloro-2-methylphenoxy)acetic acid2,4-D, (2,4-diclorophenoxy) acetic acidkochia, Kochia scoparia (L.) Shrad. # KCHSCCross-resistanceherbicide resistancenegative resistanceKCHSCR, sulfonylurea-resistantS, sulfonylurea-susceptibleSU, sulfonylurea
Type
Research
Information
Weed Technology , Volume 11 , Issue 2 , June 1997 , pp. 270 - 276
Copyright
Copyright © 1997 by the Weed Science Society of America 

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