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Optimizing Wild Oat (Avena fatua) Control with ICIA 0604

Published online by Cambridge University Press:  20 January 2017

F. Craig Stevenson ,
F. A. Holm  and
Ken J. Kirkland
F. Craig Stevenson
Affiliation:
206A Dunlop Street, Saskatoon, SK Canada S7N 2B7
F. A. Holm*
Affiliation:
Department of Plant Sciences, University of Saskatchewan, 51 Campus Drive, Saskatoon, SK Canada S7N 5A8
Ken J. Kirkland
Affiliation:
Agriculture and Agri-Food Canada, RR #1, Vermilion, AB Canada T9X 1Y6
*
Corresponding author's E-mail: holm@usask.ca.
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Abstract

Wild oat (Avena fatua) control often is an integral management practice in cropping systems that include cereal crops. Experiments were conducted at two locations in Saskatchewan (Saskatoon and Scott), Canada, from 1994 to 1997 to determine the influence of ICIA 0604 rate (50, 100, 150, and 200 g ai/ha), water volume (30, 50, and 100 L/ha), spray mixture pH (unbuffered, close to pH 7.0; reduced, pH 4.0), late morning and evening application times, and sodium bicarbonate concentration of water source (Saskatoon water, negligible; Scott water, 695 mg/L) on wild oat fresh weight and wheat (Triticum aestivum) grain yield. Reducing ICIA 0604 rate below the recommended label rate (200 g/ha) increased wild oat fresh weight by 22% and decreased wheat grain yield by 7% when applied with 50 or 100 L/ha of water. Applications with 30 L/ha of water resulted in more wild oat growth (19%) and less wheat yield (6%), regardless of the ICIA 0604 rates. Spray mixture pH or time of application did not modify the effects of ICIA 0604 rate and water volume on wild oat fresh weight and wheat yield at Saskatoon. At Scott, the negative effects of ICIA 0604 rates lower than 200 g/ha applied with 50 or 100 L/ha of water were most apparent when applications were made in the morning, especially with an unbuffered spray mixture. ICIA 0604 applications made in the evening with 50 or 100 L/ha of water resulted in the lowest wild oat fresh weights and greatest wheat yields, regardless of the ICIA 0604 rate or spray mixture pH. Antagonism between sodium bicarbonate in the unbuffered water from Scott, as indicated by the spray mixture pH effect, and the time of application effect were important factors controlling treatment responses at Scott. Lower than recommended ICIA 0604 rates often maintained net returns, even though wheat yield responded negatively to reduced ICIA 0604 rates. Understanding the effects of water quality on wild oat control will allow producers to make prudent decisions regarding the optimal application parameters for ICIA 0604.

Keywords

ICIA 0604 (proposed common name, tralkoxydim), 2-[1-(ethoxyimino)propyl]-3-hydroxy-5-(2,4,6-trimethylphenyl)cyclohex-2-enonewild oat, Avena fatua L. #3 AVEFAhard red spring wheat, Triticum aestivum L.Water volumespray mixture pHtime of applicationweed interferenceAVEFA
Type
Research Article
Information
Weed Technology , Volume 14 , Issue 3 , September 2000 , pp. 608 - 616
Copyright
Copyright © Weed Science Society of America 

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