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Postemergence Control of Foxtail Barley (Hordeum jubatum) Seedlings in Spring Wheat (Triticum aestivum) and Flax (Linum usitatissimum)

Published online by Cambridge University Press:  12 June 2017

Robert E. Blackshaw ,
Greg Semach  and
Toby Entz
Robert E. Blackshaw*
Affiliation:
Research Centre, Agriculture and Agri-Food Canada, P.O. Box 3000, Lethbridge, AB, Canada T1J 4B1
Greg Semach
Affiliation:
Research Centre, Agriculture and Agri-Food Canada, P.O. Box 3000, Lethbridge, AB, Canada T1J 4B1
Toby Entz
Affiliation:
Research Centre, Agriculture and Agri-Food Canada, P.O. Box 3000, Lethbridge, AB, Canada T1J 4B1
*
E-mail of corresponding author: [email protected].
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Abstract

Field experiments were conducted to identify herbicides for selectively controlling foxtail barley seedlings in spring wheat and flax. ICIA0604, fenoxaprop-P/safener, CGA184927/safener, metribuzin, and MON37500 in wheat and sethoxydim, clethodim, quizalofop, fluazifop-P, and the mixture of fluazifop-P/fenoxaprop-P in flax were applied at the three- to four-leaf and one- to three-tiller stages of foxtail barley. MON37500 was the only herbicide tested in wheat that provided excellent control of foxtail barley and a high degree of crop tolerance. MON37500 at 13 to 19 g/ha applied at the early growth stage controlled foxtail barley but rates of 25 to 30 g/ha were needed at the later growth stage. In flax, quizalofop was the most efficacious herbicide on foxtail barley. Sethoxydim and clethodim sometimes provided weed control similar to that of quizalofop when applied at the three- to four-leaf stage, but quizalofop was always more effective at the one- to three-tiller stage of foxtail barley. Wheat and flax yields were greater when effective herbicides were applied at the early than at the late stage, indicating the need for early control of foxtail barley to minimize weed competition. MON37500 in wheat and quizalofop in flax provide growers with highly efficacious herbicide options for in-crop control of foxtail barley in conservation tillage systems.

Keywords

quizalofop, 2-[4-[(6-chloro-2-quinoxalinyl)oxy]phenoxy]propanoic acidflax, Linum usitatissimum L. ‘Flanders'foxtail barley, Hordeum jubatum L. # HORJUwheat, Triticum aestivum L. ‘Katepwa'Growth stageherbicide timingyieldHORJU
Type
Research
Information
Weed Technology , Volume 12 , Issue 4 , December 1998 , pp. 610 - 616
Copyright
Copyright © 1998 by the Weed Science Society of America 

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Footnotes

1

LRC Contribution 38797101.

References

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