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
StewardshipBee Buffer Strip Initiative Seeks 100 Ohio Farmers
August 31, 2015
The U.S. Bee Buffer Project, an initiative of the Pollinator Partnership (P2), Burt’s Bees and The Burt’s Bees Greater Good Read More
2015 ShowStopper Award, MAGIE
EquipmentA ShowStopper From Case IH: The Patriot 2250
August 31, 2015
For nine years now, visitors to the yearly Midwest AG Industries Exposition (MAGIE) show have been tasked with not only Read More
Crop InputsMonsanto, FMC Expand Roundup Ready PLUS Platform
August 31, 2015
FMC Corp. and Monsanto Co. announced today an expanded agreement to continue their participation in the Roundup Ready PLUS Crop Read More
Deere Nutrient Applicator
Eric SfiligojThe Good & Bad News From MAGIE
August 31, 2015
As I write this column, I’ve just returned from the annual Midwest AG Industries (MAGIE) trade show in Bloomington, IL. Read More
CPS Morenci receiving its 4R certification
StewardshipCPS Morenci Becomes First Michigan Facility Certified I…
August 31, 2015
The 4R Nutrient Stewardship Certification Program has announced that Crop Production Services, Inc.’s facility located in Morenci, MI, has been Read More
EquipmentDeere Announces Soucy Track Distribution Alliance
August 28, 2015
John Deere announces an alliance with Soucy Track to sell and distribute products through the John Deere dealer channel. “This Read More
FertilizerFall-Applied Phosphorus: A Rooted Investment
August 28, 2015
As commodity prices decrease and input prices continue to rise, farmers are seeking more efficient strategies for meeting a high Read More
Monsanto Sign
Crop InputsWhat’s Next For Monsanto, Syngenta?
August 28, 2015
After dropping its $47 billion bid to take over Swiss agribusiness firm Syngenta, Monsanto may be turning its focus to Read More
Golden Harvest Corn stalks
Crop InputsMonsanto: Syngenta Not The Only Horse In Crop Protectio…
August 28, 2015
Monsanto Co, having ditched an audacious $46 billion (£30 billion) offer for Syngenta AG, may downshift to a humbler strategy Read More
ManagementConsolidation hits and a miss; And a look at China’s ch…
August 28, 2015
As Monsanto suspends its pursuit of Syngenta, consolidation news at the retail and distribution level heats up. CropLife magazine’s Executive Read More
Corn Field
MicronutrientsHuma Gro Introduces New Boron Liquid Nutrient Formulati…
August 28, 2015
BORO-MAX, a new boron (B) 10% liquid nutrient formulation, has been added to the Huma Gro product line. This new Read More
Crop InputsNFU: Monsanto Decision To Withdraw Syngenta Bid ‘…
August 26, 2015
National Farmers Union (NFU) President Roger Johnson said the organization was very pleased by the news that Monsanto has withdrawn Read More
Crop InputsMonsanto Withdraws Bid For Syngenta
August 26, 2015
Monsanto Co. abandoned its latest effort to acquire Syngenta AG, the world’s top maker of pesticides, after a sweetened bid Read More
Syngenta Sign
Crop InputsSyngenta Comments On Monsanto Announcement
August 26, 2015
The Board of Syngenta confirms that it received a verbal proposal from Monsanto to acquire the company at a price Read More
Case IH Patriot 2250 Sprayer
EquipmentHigh-powered Case IH Patriot 2250 Sprayer Pushes Throug…
August 26, 2015
Engineered with more muscle, the new 660-gallon-capacity Patriot 2250 sprayer features best-in-class horsepower, along with the fuel efficiency that comes Read More
Crop InputsLand ‘O Lakes, United Suppliers Finalize Merger
August 24, 2015
According to a press release on August 24, owners of United Suppliers, Inc. and members of Land O’Lakes, Inc. “have Read More
TMX-2050 In-Cab Display Launch Run Screen
Eric SfiligojPrecision Ag Could Shine In Increased Spotlight On Agri…
August 24, 2015
By any measure, 2015 is turning into one of the most challenging years agriculture has ever experienced. All throughout good Read More
ManagementCrop Conditions In Minnesota and Traveling Time
August 21, 2015
Editors Paul Schrimpf and Eric Sfiilgoj discuss the crop outlook from a field trip to Minnesota and upcoming travel plans. Read More