 Soybean
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Soybean Rust Update
September 8, 2009
(3 minutes: 24 seconds)
3GP (3G Mobile Phones)
(3 minutes: 24 seconds)
MP3 (audio only)
(3 minutes: 24 seconds)
MP4 (iPhone)
(3 minutes: 24 seconds) WMV (PC)
Audio/Video Script:
Scott Monfort
Extension Plant Pathologist
I’m Scott Monfort Extension Plant Pathologist with the University of Arkansas Division of
Agriculture. I wanted to take a little time today, September the 8th
and talk to you a little bit about the soybean rust situation here in the state.
The primary thing you need to look for when you are trying to decide whether or
not to put out a fungicide is where are you located. So far Soybean Rust again
has been found from the east central part of the state to the south.
The second thing that you need to look for and is very important before you
make a fungicide application is what growth stage am I at. If you’re at growth
stage 5.5 and greater then we’re saying you’re probably going to outrun the
problem and a fungicide may not be economical. However, if you’re between a 4.5
and a 5.5 you may want to apply a fungicide for control of Soybean Rust. And in that case what you want to
apply is a TRIzol by itself.
Now if you’re at an earlier growth stage say early R4 and
younger then there are a few other things you have to take in account. One, are
these beans at a high enough yield potential that will warrant, or pay for a
fungicide application? If so well then you will
have to make that decision based on where you’re at whether or not you need put
out a fungicide now or you want to wait a little bit and sample that field send
it in to the diagnostic lab and get a confirmation on whether or not you have
rust in it. But for most of you guys in these areas where we have confirmed
soybean rust you’ve got to make that decision on whether not you want to protect
them now or wait a little bit.
You also need to be aware of the other diseases that are out there. I’ve had
a few calls regarding aerial blight and frog eye and you’re wondering if you
need to wait to see if rust develops. That is something that you do not want to
do.You want to make sure you control these other diseases along with controlling
rust if you need to and then monitor that field as it gets closer to your five, growth stage
five and see if there is a possibility of rust coming back in because if you
apply at R3 your residual may run out by R5 so you may have to apply again you
know, for rust control and I’m talking about a TRIzol only then. But that’s only
if it starts and develops later in that growing season.
We are expecting the rust situation to move out a little bit further. We had
enough cloudy weather, enough wind and some rain in areas that will promote this
disease to develop and spread out. So over the next couple of weeks you’ll probably hear of more
areas start to develop or be confirmed with Soybean Rust so please stay tuned
and we will continue to update as quick as we can.
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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