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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
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

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.

Type
Research
Copyright
Copyright © 1990 by the Weed Science Society of America 

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References

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