University of Alberta research project determines alternate application
window for controlling glyphosate-resistant kochia
MISSISSAUGA, ON, June 6, 2013 /CNW/ - A University of Alberta-led
research study has found that post-harvest herbicide applications
significantly reduce kochia seed set. The findings provide growers with
new ammunition in the fight against glyphosate-resistant kochia.
In 2012, University of Alberta, with the support of BASF Canada Inc. and
Natural Science and Engineering Research Council of Canada (NSERC),
initiated trials to look for alternate ways to control
glyphosate-resistant kochia in Western Canada. The research looked at
the efficacy of post-harvest applications to specifically reduce the
seed set of glyphosate-resistant kochia and add a different herbicide
into crop rotations.
"Herbicide-resistant weeds are spreading, but we're also getting more
and more resistant species and have seen the first occurrence of
herbicide resistance to glyphosate," said Linda Hall, Lead Research at
University of Alberta who conducted the study. "With the research, we
were trying to determine whether there is a post-harvest treatment that
can reduce the seed set of kochia."
Kochia is a unique weed with the ability to germinate at low soil
temperatures and can produce between 10,000 and 25,000 seeds per plant.
It emerges very early and matures very late, which means using multiple
modes of action to control kochia at post-harvest could be an
alternative action to combat the noxious weed.
"To investigate the post-harvest control window, we went in after
harvest and applied a range of herbicides. In those trials we measured
the amount of seed left on the plant and the amount that had fallen
onto the ground. We found two herbicides that were effective at
reducing seed set, and very dramatically. Fifty per cent reductions
were seen with DISTINCT® and paraquat," said Hall.
The research findings open a new opportunity for weed management. With
more in-depth research coming, post-harvest applications with products
that have additional modes of action like DISTINCT are likely to result
in fewer seeds on the soil and will help combat glyphosate resistance.
"We're really excited about this preliminary research. The post-harvest
option is basically an unexplored opportunity to do some weed control
to reduce the seed bank of weeds. Herbicides like DISTINCT show some
great promise," says Hall.
Growers concerned about glyphosate resistance should visit www.weedtool.com. The website is an online weed resistance risk assessment that allows
users to measure the risk of glyphosate resistance developing and it
also contains valuable agronomic advice to manage resistance.
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