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Field-Scale Time of Weed Removal in Canola

Published online by Cambridge University Press:  20 January 2017

K. Neil Harker ,
John T. O'Donovan ,
George W. Clayton  and
John Mayko
K. Neil Harker*
Affiliation:
Agriculture and Agri-Food Canada (AAFC), Lacombe Research Centre, 6000 C&E Trail, Lacombe, Alberta, Canada T4L 1W1
John T. O'Donovan
Affiliation:
Agriculture and Agri-Food Canada (AAFC), Lacombe Research Centre, 6000 C&E Trail, Lacombe, Alberta, Canada T4L 1W1
George W. Clayton
Affiliation:
AAFC, Lethbridge Research Centre, P.O. Box 3000, Lethbridge, Alberta, Canada T1J 4B1
John Mayko
Affiliation:
Canola Council of Canada, P.O. Box 325, Mundare, Alberta, Canada T0B 3H0
*
Corresponding author's E-mail: [email protected].
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Abstract

Field-scale experiments were conducted at several western Canada locations to determine the importance of early weed removal over variable landscapes. In eight of 10 cases, imidazolinone-resistant (IR) canola yield decreased linearly as herbicide application (15/15 g/ha imazamox/imazethapyr or 15/15 g/ha imazamox/imazethapyr plus 150 g/ha clopyralid) was delayed beyond the one- to two-leaf stage. In two of 10 cases, canola oil content also decreased as herbicide treatment was delayed. Canola yields at all environments (location by year combinations) averaged 2,073, 1,872, or 1,650 kg/ha when treated at the one- to two-, three- to five-, or six- to seven-leaf stage, respectively. Assuming canola prices from a low of $250/t to a high of $650/t, growers could lose $50 to $131/ha, respectively, by delaying herbicide application from the one- to two- to the three- to five-leaf stage, or $106 to $275/ha, respectively, by delaying herbicide application from the one- to two- to the six- to seven-leaf stage.

Keywords

Clopyralidimazamoximazethapyrcanola, Brassica napus L. ‘46A73’Critical periodduration of competitioneconomic losslate sprayingoilseed rapespray timing
Type
Note
Information
Weed Technology , Volume 22 , Issue 4 , December 2008 , pp. 747 - 749
Copyright
Copyright © Weed Science Society of America 

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References

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