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Influence of Picloram Alone or Plus 2,4-D on Control of Wild Oats (Avena fatua) with Four Postemergence Herbicides

Published online by Cambridge University Press:  12 June 2017

P. Ashley O'Sullivan
P. Ashley O'Sullivan*
Affiliation:
Agric. Can. Res. Stn., Lacombe, Alberta, TOC 1SO
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Abstract

Field experiments were conducted for 2 yr to determine the influence of picloram (4-amino-3,5,6-trichloropicolinic acid) and a commercial mixture of picloram plus 2,4-D [(2,4-dichlorophenoxy)acetic acid] (1:16, w/w) on control of wild oats (Avena fatua L. # AVEFA) with four postemergence herbicides. The phytotoxicity to wild oats of barban (4-chloro-2-butynyl m-chlorocarbanilate) or difenzoquat (1,2-dimethyl-3,5-diphenyl-1H-pyrazolium) in 1981 and diclofop {2-[4-(2,4-dichlorophenoxy)-phenoxy] propanoic acid} or flamprop [N-benzoyl-N-(3-chloro-4-fluorophenyl)-DL-alanine] in 1981 and 1982 was reduced when these herbicides were applied in a mixture with picloram plus 2,4-D. Consequently, the use of these mixtures for broad-spectrum weed control in one spray operation is not recommended. Picloram applied at a rate equivalent to the amount present in the picloram plus 2,4-D mixture did not influence the control of wild oats obtained with any herbicide, indicating that the antagonism was due to the 2,4-D component of the picloram plus 2,4-D mixture.

Keywords

Herbicide mixturesantagonismbarbandiclofopdifenzoquatflampropAVEFA
Type
Research Article
Information
Weed Science , Volume 31 , Issue 6 , November 1983 , pp. 889 - 891
Copyright
Copyright © 1983 Weed Science Society of America 

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References

Literature Cited

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