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Effect of Shading on Activity of Imazamethabenz and Fenoxaprop in Wild Oat (Avena fatua)

Published online by Cambridge University Press:  12 June 2017

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

Growth chamber and greenhouse studies were conducted to evaluate effects of long-term low-light intensity on wild oat control with imazamethabenz and fenoxaprop. Seventy percent shading imposed during the entire experimental period resulted in enhanced activities for both herbicides applied at early and later growth stages. Such shading also reduced wild oat regrowth following application of imazamethabenz and fenoxaprop. When applied to plants exposed to 70 to 90% prespraying shading, both herbicides had phytotoxicity similar to, or better, than plants grown under continuous shading. Postspraying shading has less effect on herbicidal activity than prespraying shading or prolonged shading, especially with imazamethabenz. Full-light treatment more adversely affected fenoxaprop activity than imazamethabenz activity.

Keywords

Imazamethabenz, (±)-2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-4(and 5)-methylbenzoic acid (3:2)fenoxaprop, (±)-2-[4-[(6-chloro-2-benzoxazolyl)oxy]phenoxy] propanoic acidwild oat, Avena fatua L. # AVEFALight intensityleaf areagrowth stageimidazolinonesareyloxyphenoxypropionic acidsAVEFA
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 42 , Issue 1 , March 1994 , pp. 66 - 69
Copyright
Copyright © 1994 by the Weed Science Society of America 

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