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Multiple herbicide–resistant canola can be controlled by alternative herbicides

Published online by Cambridge University Press:  20 January 2017

Hugh J. Beckie ,
Ginette Séguin-Swartz ,
Harikumar Nair ,
Suzanne I. Warwick  and
Eric Johnson
Ginette Séguin-Swartz
Affiliation:
Agriculture and Agri-Food Canada, Saskatoon Research Centre, 107 Science Place, Saskatoon, SK, Canada S7N 0X2
Harikumar Nair
Affiliation:
Agriculture and Agri-Food Canada, Saskatoon Research Centre, 107 Science Place, Saskatoon, SK, Canada S7N 0X2
Suzanne I. Warwick
Affiliation:
Agriculture and Agri-Food Canada, Eastern Cereal and Oilseeds Research Centre, K. W. Neatby Building, C. E. F., Ottawa, ON, Canada K1A 0C6
Eric Johnson
Affiliation:
Agriculture and Agri-Food Canada, Scott Research Farm, P.O. Box 10, Scott, SK, Canada S0K 4A0
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Abstract

Unintentional herbicide resistance gene stacking in canola may alter the sensitivity of volunteers to herbicides of alternative modes of action commonly used for their control. Greenhouse experiments were conducted to investigate the response of three single-herbicide–resistant (HR) cultivars (glyphosate, glufosinate, imidazolinone), one non-HR cultivar, and seven multiple (double or triple)–HR experimental lines to 2,4-D (amine and ester), MCPA ester, and metribuzin applied at the two- to three-leaf stage and of one non-HR and four HR cultivars (glyphosate, glufosinate, imidazolinone, bromoxynil) to 2,4-D amine applied at two growth stages (two- to three-leaf stage and five- to six-leaf stage). All canola cultivars or lines treated at the two- to three-leaf stage responded similarly to increasing doses of each of the three herbicides. At the five- to six-leaf stage, however, the bromoxynil HR cultivar was less sensitive to 2,4-D than the other cultivars. The results of this study suggest that canola with multiple-herbicide–resistance traits does not differ from cultivars that are non-HR or single HR in its sensitivity to herbicides commonly used to control volunteers. All volunteers, whether non-HR, single HR, or multiple HR, should be treated when plants are most sensitive to herbicides (two- to four-leaf stage) to reduce their interference against crops and their perpetuation of gene flow.

Keywords

bromoxynil2,4-DglufosinateglyphosateMCPAmetribuzincanola, Brassica napus L.Gene stackingherbicide resistancepleiotropic effectsvolunteers
Type
Weed Management
Information
Weed Science , Volume 52 , Issue 1 , February 2004 , pp. 152 - 157
Copyright
Copyright © Weed Science Society of America 

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