Quietly, Rust Becoming More Active In South

Soybean rust, which survives on leaves of kudzu as well as soybean plants, was not active early this year in Gulf Coast states, where it is annually detected first during the growing season. Hot, dry weather, including severe drought in Texas, has kept the rust spores from spreading through the air.

The most recent report was in a commercial research plot in Marion County, FL on Aug. 17. Two days prior, soybean rust was reported in nine new counties in Mississippi, all in commercial soybean fields, and soybean rust could no longer be detected in Texas. On Aug. 13, soybean rust was reported in Tensas County, LA on soybeans, and in Suwannee County, FL on kudzu. In 2009, soybean rust has been found in seven states and 54 counties in U.S., and in two states and five municipalities in Mexico.

Florida
“Soybean rust is continuing to develop in Florida,” says James Marois, University of Florida plant pathologist. “Since Aug. 5, five new counties have become positive, and there are now 14 positive counties in Florida. Tropical Storm Claudette is bringing large amounts of rain to the panhandle and expected to travel northwest.

Marois advises Florida growers and retailers to “be on the lookout for soybean rust. With the recent rains and the maturing crop we are likely to begin to encounter field infections.”

Mississippi
Soybean rust was detected Aug. 13 in a commercial soybean field just west of Stoneville/Leland. According to Tom Allen, Mississipi State University (MSU) plant pathologist and Troy Koger, soybean Extension specialist, “the soybeans were at the R7 growth stage. Levels of rust within the field were low. The soybean field had NOT received an R3/R4 fungicide application.”

The following day, soybean rust was reported in commercial soybean fields in Carroll, Grenada, Humphreys, Leflore, Montgomery, Sunflower, Yallabusha, and Yazoo counties. “Rust levels were extremely low in all of the fields save for one field in Montgomery County, immediately east of Winona, MS,” say Allen and Koger. “All soybean fiels were beyond R5.7, so they are out of the woods and would not require treatment.

Louisiana
According to Clayton Hollier, Louisiana State University plant pathologist, “three commercial fields of soybeans were found to be positive this week — all in Iberia Parish. Incidences were 18 percent, 7 percent, and 4 percent respectively and were in either R7 to R8 depending on location.”

Hollier adds that “Tensas Parish was positive for one location in a research plot with 10 percent incidence. The beans were in R6-7.”

Texas
As of Aug. 15, soybean plants are maturing throughout Texas, at least at pod fill or more mature. However, there are plants in the seedling stage in the Lower Rio Grande Valley, which will be the fall crop there, according to Tom Isakeit, Texas A&M University plant pathologist.

“There is still no rust at any the soybean sentinel sites in Texas,” Isakeit says. “The rust at one kudzu site, in Livingston, Polk County, in east Texas, is no longer detectable. Continued dry weather in central and southern Texas will not support establishment and development of rust.

“Recent rains in east Texas have not increased the risk there, as there is apparently no source of spores to start an epidemic,” he adds. “At this time, no preventative fungicides are recommended anywhere in the state.”

Isakeit also observes that “mineral deficiencies — particularly iron — are becoming apparent in some fields undergoing moisture stress. Some of these symptoms may resemble rust.”

Missouri
Because of the proximity of the recent Arkansas and Mississippi detections, Missouri officials have put their soybean rust scouts on alert. The findings are about 250 miles from southeast Missouri.

“Soybean rust has not been detected in Missouri this year,” says Allen Wrather, University of Missouri (MU) Extension plant pathologist. “This is the first find of rust this year in those two states. The weather during the next few weeks will greatly impact the spread of rust.”

Soybean rust has been found in Missouri four of the last five years, but always late in September or October, near harvest. Wet weather in Missouri this spring delayed planting. “Soybean maturity and harvest will be later than normal,” Wrather says. “Rust that develops in September might damage late-maturing soybean plans and reduce yield.”

For most of the 2009 growing season, prevailing winds have been from the northwest, bringing cooler than normal weather to the region. That may change with the coming hurricane season, Wrather says.

Leave a Reply

Latest News
Soybean Closeup
FungicidesNew CROSSOVER PRO Formulation Offers Insect and Disease…
March 29, 2017
INNVICTIS CROP CARE, LLC has launched CROSSOVER PRO as a first of its kind formulation combining propiconazole and lambda-cyhalothrin for Read More
Trade Summit
Crop Inputs3 Compelling Reasons to Attend the AgriBusiness Global …
March 29, 2017
The AgriBusiness Global Trade Summit is the world’s premier sourcing event for crop protection and plant health products. Its core Read More
ManagementStudy: Farming Becoming Riskier Under Climate Change
March 28, 2017
Scientists the world over are working to predict how climate change will affect our planet. It is an extremely complex Read More
Young Corn Plants
Crop NutritionProtecting Nitrogen Provides Economic, Environmental RO…
March 28, 2017
Every business looks to improve its return on investment and reduce its risk of loss. Farmers are no different, yet Read More
Water Drainage
Eric SfiligojDMWW Lawsuit Dismissal Good News for Ag
March 27, 2017
On March 17 while most of the nation was toasting St. Patrick’s Day, agriculture was likely lifting a glass (or Read More
Eric Jenks, Wilbur-Ellis
Crop InputsWilbur-Ellis Launches ADVANTIGRO Plant Growth Regulator…
March 27, 2017
Wilbur-Ellis Agribusiness, a recognized leader in the marketing and distribution of crop protection, seed and nutritional products, as well as Read More
Yara West Sacramento Ribbon Cutting
Crop InputsYara West Sacramento Is Newest Addition
March 27, 2017
Yara’s West Sacramento Terminal was officially welcomed March 21 as the newest Yara North America facility in the U.S. While continually Read More
UncategorizedPrecision Ag, Iowa Water, and GM Corn Updates
March 24, 2017
Editors Paul Schrimpf and Eric Sfiligoj look at the state of precision agriculture, the dismissal of the Des Moines Water Read More
Pam Marrone
Crop InputsMarrone Bio Innovations Enters Biostimulants Market Wit…
March 23, 2017
Marrone Bio Innovations, Inc. is expanding beyond biopesticides and crop protection and into the biostimulant market by commercially launching Haven Read More
Nutrients for Life Foundation Teacher
FertilizerNutrients For Life Foundation Celebrates 10 Years Teach…
March 23, 2017
Those in agriculture know fertilizer is a vital ingredient to grow strong, productive crops. In fact, fertilizer is responsible for Read More
ManagementThink You Know Water? Take WinField United’s R…
March 22, 2017
Water is among our most precious resources, and arguably the hardest working, with just one percent available for human use, Read More
Corn Field
LegislationTFI Hopes Court Dismissal Is ‘Final Chapter’…
March 20, 2017
The Fertilizer Institute (TFI) released the following statement from President, Chris Jahn on the March 17, 2017, federal court dismissal Read More
Wheat Growers
Industry NewsWheat Growers CEO Dale Locken To Retire
March 20, 2017
CEO Dale Locken has announced that he plans to retire from Wheat Growers. Locken has served almost 15 years as Read More
Bayer Monsanto
Eric SfiligojBayer-Monsanto: Life, LibertyLink, And The Pursuit Of R…
March 20, 2017
As the calendar officially turns to spring, life is in full renewal mode. Flowers are blooming, birds are singing, and Read More
Corn Field
Crop InputsUltra Yield Micronutrients Acquires Kronos Micronutrien…
March 16, 2017
Ultra Yield Micronutrients, Inc. ”Ultra”, an affiliate of Cameron Chemicals, Inc., is pleased to announce that it has acquired the Read More
ManagementSnowstorms, Asset Sales, and Soybeans Prices
March 16, 2017
Editors Paul Schrimpf and Eric Sfiligoj discuss the weather, precision ag, crop protection company mergers, and commodity prices in this Read More
Soybean Field
Seed/BiotechBayer Invests $8.1 million In Soybean Advancement In Th…
March 16, 2017
Growers in Illinois and across the Midwest now have the added benefit of a state-of-the-art soybean research facility, increasing accessibility Read More
CHS
CropLife 100CHS Acquires Western Co-op Transport Association
March 16, 2017
CHS Inc., North America’s leading farmer-owned cooperative and a global energy, grains and foods company, has purchased Western Co-op Transport Read More