More Soybean Rust, But Mostly Too Late

By Amy L. Fahnestock
Senior Associate Editor

The number of counties reporting Asian soybean rust by Aug. 31 this year is more than double findings on the same date in 2008, but in many states, the soybean crop is far enough along and yields will not be affected. Soybean rust has been found in seven states and 84 counties in the U.S. so far in 2009, and in two states and five municipalities in Mexico.

“Clearly, things are much further ahead this year, and this is probably due to the early finds in Louisiana a few months back,” says Don Hershman, University of Kentucky Extension plant pathologist.

On Aug. 29, rust was detected on kudzu in Jackson County, FL.

Aug. 28 was a prolific day for soybean rust confirmations. All told, rust was reported in Drew, Lincoln, Desha, and Lee counties in Arkansas; LaFayette, Morehouse, and West Carroll parishes in Louisiana; Attala, De Soto, and Madison counties in Mississippi; and in Greene County, AL.

Louisiana: The positive findings of soybean rust in the state the last week of August were in commercial fields, according to Clayton Hollier, Louisiana State University Extension plant pathologist. Two of the fields were late R6 and R4, while the other two were at the R7 stage. Louisiana has 20 confirmations of soybean rust in 2009.

Mississippi: Soybean rust was found at low levels in a commercial soybean field at the R6 growth stage in Tunica County on Aug. 26, report Tom Allen, Mississippi State University (MSU) plant patholgist and Trey Koger, MSU Extension soybean specialist.

More rust was detected three straight days, Aug. 21-23, in commercial soybean fields in Quitman, Tallahatchie, Calhoun, and Coahma counties on soybeans in the R7-R8 growth stages. The overall count for affected counties in the state is now 19, and the pair are not recommending any management strategies because of the late growth stages and low spore incidence.

Alabama: Rust was detected at very low levels in a commercial soybean field in Greene County on Aug. 28. This followed soybean rust confirmations on Aug. 20, 23, and 26. “Wet weather patterns earlier this month appear to have spread soybean rust to a good portion of the state,” sayd Ed Sikora, Auburn University Extension plant pathologist. Rust has now been found in 15 counties in Alabma.

“Growers with soybeans in the R3-R4 growth stages with good yield potential that have not been sprayed previously should consider applying a tank mix combination of a stobilurin and a triazole fungicide or a prepackaged tank mix of the two products,” Sikora says.

“Growers with fields at the R5 growth stage with good yield potential that have not been previously spreayed with a fungicide should consider an application or a triale fungicide,” Sikora adds. “Soybeans that have reached the full pod R6 growth stage do not require a fungicide application for the purpose of preventing soybean rust.”

Hershman expects to find Asian soybean rust in Kentucky fairly soon. “The fact that the disease has been detected in north Alabama is significant, and means that we and Tennessee will be the next states to report soybean rust. I truly believe that our soybeans crops ar no longer at risk for damage.”

Leave a Reply

Latest News
Crop InputsDuPont Pioneer: Corn Belt P and K Levels Lagging
August 24, 2016
A new DuPont Pioneer study conducted across 12 Corn Belt states demonstrates that growers may be leaving profit potential in Read More
Monsanto sign
Crop InputsCould a Monsanto-Bayer Union Be 2 Weeks from Fruition?
August 24, 2016
Via STLToday.com (The St. Louis Post-Dispatch): Merger talks between Monsanto Co. and Bayer AG are advancing after a series of Read More
EquipmentCase IH Debuts Nutri-Tiller 955 Strip-Till Applicator
August 24, 2016
With strip-till continuing to expand across new acres, Case IH designed the new Nutri-Tiller 955 strip-till applicator to help producers Read More
EquipmentCase Launches Aim Command FLEX, 25th Anniversary Patrio…
August 24, 2016
Case IH announces new AIM Command FLEX advanced spray technology for greater application accuracy, as well as special 25th Anniversary Read More
ASMARK 2016 Retailers Live! Tour - CPS
CropLife 100CPS Acquires Texas Retail Operation
August 23, 2016
Crop Production Services (CPS) has acquired the assets of Larry’s Chemical and Spray, Inc., for an undisclosed amount in an Read More
PrecisionAg Video Conference
Precision AgVideo: PrecisionAg Vision Conference
August 22, 2016
A Strategic Conference Focused on the Future of Farm Digitization and Precision Agriculture Visit precisionagvision.com and register today! Read More
Young Corn Plants
Industry NewsOABA Welcomes Nicole Wallace As Communication & Adm…
August 22, 2016
The Ohio AgriBusiness Association has hired Nicole Wallace as its communication and administrative coordinator. Wallace will help provide comprehensive communication Read More
Syngenta Sign
Crop InputsChemChina, Syngenta Receive Clearance From CFIUS
August 22, 2016
China National Chemical Corp. (ChemChina) and Syngenta have announced that the companies have received clearance on their proposed transaction from the Read More
ManagementAg Industry Shows and Rumors
August 18, 2016
Editors Paul Schrimpf and Eric Sfiligoj talk about the upcoming trade show schedule, crop protection merger updates, and content for Read More
MAGIE 2015
EquipmentMAGIE Takes The Pulse Of The Ag Retail Industry
August 18, 2016
Every year, one of the major highlights of my career as an ag journalist is attending the Midwest AG Industries Read More
MAGIE 2015 Overview
EquipmentPride In Professionalism On Display At MAGIE
August 18, 2016
The Illinois Fertilizer & Chemical Association (IFCA) is proud to partner with CropLife IRON and continue the tradition of bringing Read More
SprayersJenner Ag To Debut 25th Anniversary Edition Case IH Pat…
August 18, 2016
Visitors at the 2016 Midwest Ag Industries Exhibition (MAGIE) in Bloomington, IL, will have a unique photo opportunity, as Jenner Read More
Crop InputsEU Glyphosate Controversy Heating Up Yet Again
August 17, 2016
The battle over glyphosate rages on in Europe, creating a lot of question marks over whether the herbicide will continue Read More
Industry NewsNew Partnership Provides Improved Representation At Ohi…
August 16, 2016
The Ohio AgriBusiness Association (OABA) has retained Belinda Jones of Capitol Consulting Group, Inc. (CCG) for government relations work in Read More
Tissue testing
FertilizerMosaic: 6 Tips For Better Crop Nutrition In Corn
August 16, 2016
Late in the crop season is a good time to assess visual nutrient deficiencies and ensure early- and mid-season deficiencies Read More
WebinarsWebinar Schedule
August 14, 2016
Register for one of our upcoming Webinars or access our archive of past Webinars to view recordings of presentations that may be of interest to you. Read More
Dow DuPont
Crop InputsDowDuPont Update: EU Takes Closer Look at Merger
August 12, 2016
Dow Chemical Co. and DuPont Co. face months of haggling with European Union antitrust regulators who opened an in-depth probe Read More
ManagementNews from InfoAg 2016 and Weed Wands
August 11, 2016
Editors Paul Schrimpf and Eric Sfiligoj review what happened at last week’s big Precision Ag event and a possible solution Read More