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Antagonistic Effect of MCPA on Fenoxaprop Activity

Published online by Cambridge University Press:  12 June 2017

Raymond J. A. Deschamps ,
Andrew I. Hsiao  and
William A. Quick
Raymond J. A. Deschamps
Affiliation:
Biol. Dep., Univ. Regina, Regina, SK, S4S 0A2, Canada
Andrew I. Hsiao
Affiliation:
Agric. Can. Res. Stn., Box 440, Regina, SK, S4P 3A2, Canada
William A. Quick
Affiliation:
Biol. Dep., Univ. Regina, Regina, SK, S4S 0A2, Canada
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Abstract

Greenhouse and field studies were conducted to determine the effect of the isooctyl ester of MCPA on the activity of the ethyl ester of fenoxaprop in four grass species. In the greenhouse, wheat tolerated fenoxaprop better than barley, oat, and wild oat. Among wild oat populations, SH 430 was the most tolerant to fenoxaprop followed by MON 73, CS 40, the natural population, and AN 51. MCPA reduced fenoxaprop activity in wheat and barley, protecting the crops from herbicide injury. However, MCPA did not reduce the activity of fenoxaprop in most wild oat lines. In field studies, wheat and barley treated with fenoxaprop at 150 g/ha plus MCPA at 300 g/ha were not appreciably different from weed-free controls while fenoxaprop applied alone at 150 g/ha damaged the crops. Fenoxaprop applied at 150 g/ha in combination with 300 g/ha MCPA resulted in at least 78% wild oat control.

Keywords

Isooctyl ester of MCPA, (4-chloro-2-methylphenoxy) acetic acidethyl ester of fenoxaprop, (±)-2-[4-[(6-chloro-2-benzoxazolyl)oxy]phenoxy]propanoic acidwheat, (Triticum aestivum L. ‘Columbus’)barley, (Hordeum vulgare L. ‘Klondike’)oat, (Avena sativa L. ‘Dumont’ and ‘Cascade’)wild oat, (Avena fatua L. ♯3 AVEFA)Efficacyherbicide interactionAvena fatuaTriticum aestivumHordeum vulgareAvena sativaAVEFA
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 38 , Issue 1 , January 1990 , pp. 62 - 66
Copyright
Copyright © 1990 by the Weed Science Society of America 

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