 Soybean
Podcasts
Pre-emerge Herbicides Can Control Resistant Pigweed
October 5, 2009
(2 minutes: 49 seconds)
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(2 minutes: 49 seconds)
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(2 minutes: 49 seconds)
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Audio/Video Script:
With Ken Smith Extension Weed Specialist
Good day, I’m Ken Smith University of
Arkansas Division of Agriculture Weed Scientist. Here today in a soybean field
that’s not uncommon for other farmers in the state where we’ve got herbicide
resistant pigweed. These pigweeds are all glyphosate resistant. This field has
been sprayed numerous times with glyphosate and as you can see.
Yields will be reduced, and many of our farmers are asking what
do I need to do for next year. We know we’ve lost this year but think about next
year. I’d like to show you some of our programs in Round-up Ready soybean for
program considerations next year.
This is a part of the program that I’d like to do, to share with you some of
our successes in our research plots. I think that if we look at this it tells a
real story as to where we need to be next year in some of our production
practices.
In this particular study that we are standing in the middle of here, half of this study got a
pre-emerge herbicide, the other half got no pre-emerge. Now, the half that got pre-emerge,
it really does not matter which pre-emerge we use, it could be Prefix, it could
be Authority MTZ, it could be Valor but in this particular program, as we can
see, this side of the field is clean. And we used a residual
herbicide up front we came back with Round-Up, then we came back with Round-Up
plus Dual over the top. So we have used a pre-emerge plus another application of
Dual, a second application of a residual
herbicide.
Now certainly that is more than what we have just looked at in
the study where we just saw Round-Up followed by Round-Up and more than what we
see in this part. But now in this half of the study many of the same chemicals
are applied. For instance in some of this we had Prefix applied post-emergence
rather than pre-emerge and where we applied it post-emergence we’ve got
infestations.
I think that this is a really, really important point for us next
year in our production practices to consider the importance of pre-emerge weed
control in soybeans in our glyphosate resistant pigweed areas.
Your Arkansas Soybean Podcast is a production of the University of Arkansas
Division of Agriculture and was funded in part by the Arkansas Soybean Promotion
Board. For more information on soybean farming in Arkansas contact your local
county Extension Office.
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