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Amine Salts of Growth Regulator Herbicides Antagonize Paraquat

Published online by Cambridge University Press:  12 June 2017

John T. O'Donovan  and
P. Ashley O'Sullivan
John T. O'Donovan
Affiliation:
Agric. Can. Res. Stn., Lacombe, Alberta, TOC 1SO
P. Ashley O'Sullivan
Affiliation:
Agric. Can. Res. Stn., Lacombe, Alberta, TOC 1SO
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Abstract

Amine formulations of 2,4-D [(2,4-dichlorophenoxy) acetic acid] and MCPA {[(4-chloro-o-tolyl)oxy] acetic acid} caused a reduction in paraquat (1,1-dimethyl-4,4′-bipyridinium ion) phytotoxicity to barley (Hordeum vulgare L. 'Summit′), wheat (Triticum aestivum L. ‘Neepawa′), and wild oats (Avena fatua L.). Dicamba (3,6-dichloro-o-anisic acid) reduced paraquat activity in barley only. Paraquat phytotoxicity was antagonized more by 2,4-D amine at high than at low rates. Higher rates of paraquat relative to a fixed rate of 2,4-D amine overcame the antagonism. Paraquat phytotoxicity was not antagonized by 2,4-D or MCPA amine applied as a separate treatment. The technical components of the 2,4-D- or MCPA-amine formulations were solely responsible for the antagonism. Ester formulations did not affect paraquat phytotoxicity.

Keywords

Herbicide mixturesformulation componentssequential applications
Type
Research Article
Information
Weed Science , Volume 30 , Issue 6 , November 1982 , pp. 605 - 608
Copyright
Copyright © 1982 by the Weed Science Society of America 

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References

Literature Cited

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