Control of gene-stacked canola by alternative herbicides
Date
2003-02-18
Authors
Beckie, H.J.
Séguin-Swartz, G.
Nair, H.
Warwick, S.I.
Johnson, E.
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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 dose response of three single herbicide-resistant
(HR) cultivars (glyphosate, glufosinate, imidazolinone), one non-HR cultivar, and seven multiple
(double or triple) HR experimental lines treated at the two- to three-leaf stage to 2,4-D (amine
and ester), MCPA ester, and metribuzin; 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, and five to six leaves). All canola cultivars or lines treated at the two- to three-leaf stage
responded similarly to increasing doses 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.
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Keywords
Brassica napus, gene stacking, herbicide resistance, pleiotropic effects, volunteers
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Soils and Crops Workshop