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Influence of Late Applications of Imazamox on Imidazolinone-Resistant Canola (Brassica napus)

Published online by Cambridge University Press:  20 January 2017

Eric Tozzi ,
K. Neil Harker ,
Robert E. Blackshaw ,
John T. O'Donovan ,
Stephen E. Strelkov  and
Christian J. Willenborg
Eric Tozzi
Affiliation:
Department of Plant Sciences, University of Saskatchewan, 51 Campus Drive, Saskatoon, SK, Canada S7N 5A8
K. Neil Harker
Affiliation:
Agriculture and Agri-Food Canada, 6000 C and E Trail Lacombe, AB, Canada T4L 1W1
Robert E. Blackshaw
Affiliation:
Agriculture and Agri-Food Canada, 5403-1 Avenue South, Lethbridge, AB, Canada T1J 4B1
John T. O'Donovan
Affiliation:
Agriculture and Agri-Food Canada, 6000 C and E Trail Lacombe, AB, Canada T4L 1W1
Stephen E. Strelkov
Affiliation:
Department of Agriculture, Food, and Nutritional Sciences, University of Alberta, 4-10 Agriculture Forestry Centre, Edmonton, AB, Canada T6G 2P5
Christian J. Willenborg*
Affiliation:
Department of Plant Sciences, University of Saskatchewan, 51 Campus Drive, Saskatoon, SK, Canada S7N 5A8
*
Corresponding author's E-mail: chris.willenborg@usask.ca.
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Abstract

Previous research has demonstrated that late and sequential applications of glyphosate and glufosinate can have adverse effects on glyphosate- and glufosinate-resistant canola. Similarly, imidazolinone (IMI)-resistant canola may be affected negatively by late applications of imidazolinone herbicides. Field trials were established across the Northern Great Plains region from 2010 to 2012 to examine the response of IMI-resistant canola yield, yield components, and seed quality to late and sequential applications of imazamox. Plots received either a single imazamox application at the two-leaf, six-leaf, bolt, or early bloom stages or sequential applications at the two-leaf followed by six-leaf, two-leaf followed by bolting, and two-leaf followed by early bloom stages; an unsprayed control was included for comparisons. Results indicated that in most site-years there was no effect of imazamox application timing on IMI-resistant canola yield, yield components, or seed quality. These results suggest that late and sequential applications of imazamox to IMI-resistant canola should have little effect on canola production, even if they are made beyond the recommended six-leaf stage. In situations where growers are forced to make late applications (beyond six leaves) to IMI-resistant canola, using solely imazamox appears to minimize adverse effects on seed yield and quality.

Investigaciones previas han demostrado que aplicaciones tardías y secuenciales de glyphosate y glufosinate pueden tener efectos adversos en colza resistente a glyphosate y a glufosinate. Similarmente, la colza resistente a imidazolinone (IMI) podría ser afectada negativamente por aplicaciones tardías de herbicidas imidazolinone. Experimentos de campo fueron establecidos a lo largo de la región de las Grandes Pradera del Norte, desde 2010 hasta 2012, para examinar la respuesta del rendimiento, los componentes del rendimiento, y la calidad de la semilla de la colza resistente a IMI a aplicaciones tardías y secuenciales de imazamox. Las parcelas recibieron una aplicación sencilla de imazamox en los estadios de dos-hojas, seis-hojas, producción de tallo floral, o inicio de floración o aplicaciones secuenciales en los estadios de dos-hojas seguido por seis-hojas, dos-hojas seguido por producción de tallo floral, y dos-hojas seguido por inicio de floración. Además se incluyó un control sin aplicación de herbicidas para fines de comparación. Los resultados indicaron que en la mayoría de los sitios-años no hubo ningún efecto del momento de aplicación de imazamox sobre el rendimiento, los componentes del rendimiento, ni la calidad de semilla de la colza resistente a IMI. Estos resultados sugieren que las aplicaciones tardías y secuenciales de imazamox en colza resistente a IMI deberían tener poco efecto en la producción de colza, inclusive si estas se hacen después del estadio recomendado de seis-hojas. En situaciones donde los productores son forzados a hacer aplicaciones tardías (después de seis-hojas) a colza resistente a IMI, el usar sólo imazamox parece minimizar los efectos adversos en el rendimiento y calidad de la semilla.

Keywords

Imazamox, canola, Brassica napus L.Canolaimidazolinone-resistantlate applicationsresistantseed qualitysequential applicationsyield components
Type
Research Article
Information
Weed Technology , Volume 30 , Issue 2 , June 2016 , pp. 595 - 600
Copyright
Copyright © Weed Science Society of America 

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Footnotes

Associate Editor for this paper: Robert Nurse, Agriculture and Agri-Food Canada.

References

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