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Effect of Water Stress, Nitrogen, and Gibberellic Acid on Fluazifop and Glyphosate Activity on Oats (Avena sativa)

Published online by Cambridge University Press:  12 June 2017

Ross L. Dickson ,
Mitchell Andrews ,
Roger J. Field  and
Euan L. Dickson
Ross L. Dickson
Affiliation:
Dep. Plant Sci. Lincoln Coll., Canterbury, N.Z.
Mitchell Andrews*
Affiliation:
Dep. Plant Sci. Lincoln Coll., Canterbury, N.Z.
Roger J. Field
Affiliation:
Dep. Plant Sci. Lincoln Coll., Canterbury, N.Z.
Euan L. Dickson
Affiliation:
Dep. Plant Sci. Lincoln Coll., Canterbury, N.Z.
*
Correspondence should be directed to the second author.
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Abstract

A series of experiments was carried out on oat to test the efficacies of fluazifop and glyphosate against water-stressed plants, plants grown in low and high nitrogen (N), and plants treated with gibberellic acid (GA). In the laboratory, plants maintained at wilting point for 5 days before and 9 days after spraying with fluazifop (0.5 kg ae/ha) appeared healthy 32 days after herbicide application, while plants supplied with water throughout the experiment were completely chlorotic/necrotic and had main stem detachment from within the leaf sheaths. In the field, plants maintained unirrigated until 14 days after spraying with fluazifop (0.25 kg/ha) or glyphosate (0.18 kg ae/ha) showed greater tolerance of the herbicides than plants irrigated regularly. Under well-watered conditions in the laboratory and field, fluazifop (0.25 kg/ha) and glyphosate (0.18 kg/ha) were less toxic at low N than high N. Increased fluazifop activity at high N was associated with increased transport of herbicide to apical meristems. Addition of 200 μg GA into the leaf sheaths 2 days prior to spraying with fluazifop or glyphosate increased the efficacy of both herbicides at low N.

Keywords

Oat, Avena sativa L. ‘Amuri’fluazifop, butyl ester of (±)-2-[4-[[5-(trifluoromethyl)-2-pyridinyl]oxy]phenoxy]propanoic acidglyphosate, N-(phosphonomethyl)glycineHerbicide toleranceherbicide uptakeherbicide translocationAvena sativa
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 38 , Issue 1 , January 1990 , pp. 54 - 61
Copyright
Copyright © 1990 by the Weed Science Society of America 

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