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Herbicide Resistance Management Series: History of Development in Minnesota

So the first event we saw, the first
really hint of herbicide resistance in Minnesota work,
was in the early nineteen eighties and that was with the triazine
herbicides and that’s a site of action number 5.
And that occurred in areas of the state where there was continuous corn
production and the use of atrazine, the atrazine
herbicides. And that also was in the area where we
saw dairy production and the dairy producers using one herbicide for that control. This was not
widespread and it was a manageable problem, but then
as we look in the next 10 years and the early 1990s, really around 1991,
we started to see problems with wild oat control in Northwest
Minnesota in small grains. and that was resistance to the ACCase
herbicides and that became very widespread in
Northwest Minnesota and it was due primarily to the use of
those herbicide in both small grains and row crops and that was primarily sugar beets. So in that area that was where we really first knew
that we were going to see some problems with continuous use of herbicides. And then
finally after that, about five years later, we saw
another incidence of resistance and that was
with the ALS herbicides and those were used primarily in
soybeans, but we also had ALS herbicides in small grain so as we
rotated with soybeans in small grains, that we
started to see resistance to those particular herbicides. In that case, those
herbicides in many areas could no longer be used because of the resistance. And then finally as we look at today and what everybody’s concerned about is the resistance to glyphosate or the roundup products. And that again
happened fairly slowly. Weed that resistance, we started seeing
that after continuing use for a number of years with glyphosate, but now we have glyphosate resistant weeds throughout Minnesota and in most of the cropping systems. So
as you can see that it really looks like there’s no
herbicide class or site of action that we can’t see resistance developed to and
that’s what we’re seeing now. And what we’ve also seen with all these
cases is that this resistance happen slowly, you know, that growers don’t always know
it right away or are not able to see it. It happens with one plant, may happen
with a patch of weeds, and so people, or growers, don’t respond
to it maybe as quickly as you would think that they would because it slowly builds over time. And then
generally by the time that it is recognized to be a problem, it is
throughout the field and then major action has to be taken.
And that action is not using that type of herbicide anymore,
that site of action, changing cropping patterns, and
totally changing the management strategy in those fields, as a result of using that same
herbicide, that same site of action over and over again.

Author Since: Mar 11, 2019

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