UACES Facebook Soybean Rust Update - September 8, 2009

Soybean Rust Update - September 8, 2009

You Tube - Link to watch video on You Tube.Link to transcript

Audio/Video    Script: 

Scott Monfort
Extension Plant Pathologist

[Title Slide – Soybean Rust Update, Scott Monfort, Extension Plant Pathologist, Number 13 – September 8, 2009, Your Soybean Podcast, University of Arkansas Division of Agriculture, Arkansas Soybean Promotion Board]

[Scott Monfort standing in a soybean field] 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. [Slide showing map of the state of Arkansas with county outlines; Rust Priorities (picture of soybean pods); Where are you located?]  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. [Slide showing map of the state of Arkansas with county outlines; Rust Priorities (picture of soybean pods); Counties with confirmed rust cases underlined are Woodruff, St. Francis, Lee, Monroe, Prairie, Lonoke, Pulaski, Phillips, Arkansas, Jefferson, Lincoln, Desha, Drew, Chicot, and Ashely.]

[Slide showing map of the state of Arkansas with county outlines; Rust Priorities (picture of soybean pods); Growth Stage?]  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. [Slide showing map of the state of Arkansas with county outlines; Rust Priorities; Growth Stage 5.5 + fungicide may not be necessary]  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. [Slide showing map of the state of Arkansas with county outlines; Rust Priorities (picture of soybean pods); 4.5 - 5.5 + consider fungicide]  However, if you’re between a 4.5 and a 5.5 you may want to apply a fungicide for control of Soybean Rust. [Scott Monfort] 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. [Slide - Rust Priorities (picture of soybean pods); Bean Yield Potential $ v. Fungicide cost]  One, are these beans at a high enough yield potential that will warrant, or pay for a fungicide application? [Scott Monfort] 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 gotta make that decision on whether not you wanna 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. [Slide - Rust Priorities (picture of soybean pods); Control other bean diseases along with rust] You want to make sure you control these other diseases along with controlling rust if you need to and [Scott Monfort] 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.

[Slide showing map of the state of Arkansas with county outlines; Counties with confirmed rust cases underlined are Woodruff, St. Francis, Lee, Monroe, Prairie, Lonoke, Pulaski, Phillips, Arkansas, Jefferson, Lincoln, Desha, Drew, Chicot, and Ashely.] 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. [Scott Monfort] 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.

[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]

Back to Soybean Podcasts