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Broadleaf Herbicide Effects on Clethodim and Quizalofop-P Efficacy on Volunteer Wheat (Triticum aestivum)

Published online by Cambridge University Press:  20 January 2017

Robert E. Blackshaw*
Affiliation:
Agriculture and Agri-Food Canada, Box 3000, Lethbridge, AB, Canada T1J 4B1
K. Neil Harker
Affiliation:
Agriculture and Agri-Food Canada, 6000 C & E Trail, Lacombe, AB, Canada T4L 1W1
George W. Clayton
Affiliation:
Agriculture and Agri-Food Canada, 6000 C & E Trail, Lacombe, AB, Canada T4L 1W1
John T. O'Donovan
Affiliation:
Agriculture and Agri-Food Canada, Box 29, Beaverlodge, AB, Canada T0H 0C0
*
Corresponding author's E-mail: [email protected]

Abstract

Field experiments were conducted at three locations in 2003 and 2004 to examine clethodim and quizalofop-P efficacy on spring wheat seedlings when applied alone or in tank mixtures with herbicides used to control broadleaf weeds. Clethodim at the recommended rate of 30 g/ha reduced spring wheat biomass by 63 to 98% and was only >90% in three of six site years. In contrast, quizalofop-P at the recommended rate of 36 g/ha reduced wheat biomass >90% in all cases. Clethodim or quizalofop-P could be tank mixed with 2,4-D ester, bromoxynil, or bromoxynil plus MCPA ester with little risk of reduced efficacy on wheat. However, 2,4-D amine was highly antagonistic to both herbicides. The commercial mixture of thifensulfuron plus tribenuron reduced clethodim, but not quizalofop-P, efficacy on wheat. Herbicide options exist for simultaneous control of volunteer glyphosate-resistant canola and glyphosate-resistant wheat if the latter technology were to be commercialized in the future.

Type
Research Article
Copyright
Copyright © Weed Science Society of America 

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