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Petroleum Oil and Emulsifier Affect the Phytotoxicity of Imazethapyr

Published online by Cambridge University Press:  12 June 2017

Frank A. Manthey ,
Robert Matysiak  and
John D. Nalewaja
Frank A. Manthey
Affiliation:
Formerly, Res. Sci., Dep. Crop Weed Sci., now Res. Assoc., Dep. Cereal Sci. Food Technol.
Robert Matysiak
Affiliation:
Foreign Exchange Sci., Akademia Folnicza, ul. Mazowiecka, Poznan, Poland
John D. Nalewaja
Affiliation:
Dep. Crop Weed Sci., N. Dak. State Univ., Fargo 58105
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Abstract

Six commercial petroleum oil (PO) adjuvants differed in their enhancement of imazethapyr phytotoxicity to green foxtail and kochia but not to redroot pigweed, when imazethapyr was applied postemergence at 17 g ha–1. Imazethapyr at 5 g ha–1 plus 27 combinations of three oils and nine emulsifiers reduced kochia growth by 61 to 88%. Optimum emulsifier concentration in a PO adjuvant ranged from 15 to 20% (v/v). All PO adjuvants tested produced fair to excellent oil-inwater emulsions with imazethapyr; however, emulsion stability did not correlate with weed control.

Keywords

Imazethapyr, (±)-2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-ethyl-3-pyridinecarboxylic acidgreen foxtail, Setaria viridis (L.) Beauv. ♯ SETVIkochia, Kochia scoparia (L.) Schrad. ♯ KCHSCredroot pigweed, Amaranthus retroflexus L. ♯ AMAREAdjuvantadditiveKCHSCAMARESETVIemulsion stability
Type
Research
Information
Weed Technology , Volume 6 , Issue 1 , March 1992 , pp. 81 - 84
Copyright
Copyright © 1990 by the Weed Science Society of America 

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References

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