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Split Applications of Herbicides at Reduced Rates Can Effectively Control Wild Oat (Avena fatua) in Wheat

Published online by Cambridge University Press:  20 January 2017

Sam J. Lockhart  and
Kirk A. Howatt
Sam J. Lockhart
Affiliation:
Department of Plant Sciences, North Dakota State University, Fargo, ND 58105
Kirk A. Howatt*
Affiliation:
Department of Plant Sciences, North Dakota State University, Fargo, ND 58105
*
Corresponding author's E-mail: kirk.howatt@ndsu.nodak.edu
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Abstract

Split application of herbicides for wild oat control may minimize wild oat competition with wheat while reducing the number of wild oat seeds returned to the soil. Field experiments were conducted in 2000 and 2001 to evaluate the effects of CGA-184927, fenoxaprop-P, flucarbazone, and ICIA 0604 at labeled and reduced rates on wild oat control, wild oat seed rain, and wheat yield. Each herbicide was applied once at 25, 33, and 100% of the labeled rate at the two-leaf stage of wild oat or split applied at 50 and 66% of the full rate as two equal applications. Excellent full-season wild oat control was obtained with CGA-184927, flucarbazone, and ICIA 0604 applied twice at reduced rates. ICIA 0604 or CGA-184927 split applied at 25 and 33% rates (totaled 50 and 66% of the full rate) provided wild oat control equal to one application of labeled rates. Wild oat seed rain was similar among all herbicide treatments, except plots treated with fenoxaprop-P once at 25 and 33% rates where seed rain was higher and equal to 47% of untreated plots. Wheat yields and net returns were highest and similar after treatment with CGA-184927 or ICIA 0604 applied either once at the labeled rate or split applied at 25 or 33% rates.

Keywords

Fenoxaprop-PICIA 0604 (proposed name, tralkoxydim), 2-[1-(ethoxyimino)propyl]-3-hydroxy-5-(2,4,6-trimethylphenyl)cyclohex-2-enoneCGA-184927 (proposed name, clodinafop-propargyl), propanoic acid, 2-[4-[(5-chloro-3-fluoro-2-pyridinyl)oxy]phenoxy]-2-propynyl esterflucarbazonewild oat, Avena fatua L. # AVEFAhard red spring wheat, Triticum aestivum L.Hard red spring wheatreduced herbicide ratesDAT, days after treatment
Type
Research
Information
Weed Technology , Volume 18 , Issue 2 , June 2004 , pp. 369 - 374
Copyright
Copyright © Weed Science Society of America 

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References

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