 Soybean
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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
[Title Slide – Pre-emerge Herbicides Can Control Resistant Pigweed; With
information from Ken Smith, Extension Weed Specialist; Your Soybean Podcast,
University of Arkansas Division of Agriculture, Arkansas Soybean Promotion
Board]
[Ken Smith standing in a field] 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, [video shows
pigweed in a field] the pigweed infestation is quite severe.
[Ken Smith] 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, [picture
of a soybean field that received pre-emerge herbicide] half of this study got a
pre-emerge herbicide, [picture of a soybean field that received no 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. [Picture of a soybean field. Clean soybean
test plot sprayed with a herbicide before weeds emerge.] 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, [Picture of a clean soybean field.] a second application of a residual
herbicide.
[Ken Smith] 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. [Picture of a soybean field with weeds. Soybean test plot
sprayed with a herbicide post-weed emergence.] 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. [Picture of a soybean field with weeds.]
[Ken Smith] 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.
[Narrator] 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. [Title slide - For more information
contact your local county Extension office. Your Arkansas Soybean Podcast,
University of Arkansas Division of Agriculture, Arkansas Soybean Promotion
Board]
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