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Antagonism of Diclofop Control of Wild Oat (Avena fatua) by Tribenuron

Published online by Cambridge University Press:  12 June 2017

Roger J. Baerg ,
John W. Gronwald ,
Charlotte V. Eberlein  and
Robert E. Stucker
Roger J. Baerg
Affiliation:
Univ. of Idaho, Aberdeen, ID 83210
John W. Gronwald
Affiliation:
Plant Sci. Res. Unit, U.S. Dep. Agric., Agric. Res. Serv.
Charlotte V. Eberlein
Affiliation:
Univ. of Idaho, Aberdeen, ID 83210
Robert E. Stucker
Affiliation:
Dep. of Agron. and Plant Genetics, Univ. of Minnesota, St. Paul, MN 55108
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Abstract

Tribenuron antagonized diclofop control of wild oat in greenhouse studies. Wild oat shoot fresh weight was reduced 79% when plants were treated with diclofop at 1.12 kg ha−1, but only 46% when treated with diclofop at 1.12 kg ha−1plus tribenuron at 18 g ha−1. Increasing diclofop rate increased control of wild oat but did not overcome the antagonism. Separating the applications of diclofop and tribenuron by as little as 12 s reduced the antagonism by 40%, indicating the importance of close proximity of the two herbicides on the leaf surface for the antagonistic response. The inhibitory effect of diclofop at its target site (acetylCoA carboxylase) was not reduced by tribenuron. Metabolism of 14C-diclofop by wild oat leaves was not altered quantitatively or qualitatively by tribenuron. Tribenuron had no effect on spray retention or absorption of 14C-diclofop by wild oat leaves, and only slightly decreased the total amount of radiolabel translocated out of the treated zone on the leaf. However, tribenuron decreased basipetal translocation of diclofop from the treated zone by approximately 20%. The ability of tribenuron to reduce basipetal translocation of diclofop to meristematic regions of wild oat may be a factor in antagonism.

Keywords

Diclofop, (+)-2-[4-(2,4-dichlorophenoxy)phenoxy] propanoic acidtribenuron, 2-[[[[(4-methoxy-6-methyl-1,3,5-triazin-2-y l)-methylamino]carbonyl]amino]sulfonyl]benzoic acidwild oat, Avena fatua L.♯ AVEFAacetyl-coenzyme A carboxylase (EC 6.4.1.2)Herbicide antagonismsplit-applicationsAVEFA
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 44 , Issue 3 , September 1996 , pp. 461 - 468
Copyright
Copyright © 1996 by the Weed Science Society of America 

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