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

Featured Stories
Marestail 18-24 inches infests cotton field
HerbicidesWeeds To Watch 2015: Resistance Remains Riling
April 7, 2015
Although several trade shows/groups are commemorating various anniversaries during 2015, there is another agricultural-themed milestone this year that will not Read More
Valley Irrigation variable rate irrigation
EquipmentIrrigation Control Gets Ever More Precise
April 6, 2015
As more regions of the country struggle with water conservation and off-site nutrient movement, growers are looking for ways to Read More
Eric SfiligojMonsanto Hears The WHO
March 27, 2015
Another challenge to the safety of glyphosate, and the responses from supporters and opponents, calls to mind a classic Dr. Seuss story. Read More
Spreaders17 Fertilizer Spreaders For 2015
March 25, 2015
Manufacturers shoot for versatility and accuracy in this year's crop of fertilizer spreaders. Read More
Top 100 Articles
CropLife 100Pinnacle Agriculture Acquires Minnesota Retailer
April 14, 2015
Pinnacle Agriculture Holdings, LLC, ranked No. 6 on the CropLife 100,  has successfully acquired Liebl Ag, LLC in Ada, MN.  Read More
CropLife 100CHS, Aurora Cooperative Complete Fertilizer Storage, Grain Shuttle Loading Facility
April 13, 2015
CHS Inc., the nation’s leading cooperative and ranked No. 5 on the CropLife 100, and Aurora Cooperative (ranked No. 21) Read More
CropLife 100GROWMARK Acquires Missouri Refined Fuels Terminal
April 2, 2015
Bloomington, IL-based GROWMARK and Magellan Pipeline Co. have entered into an agreement in which GROWMARK will acquire the refined fuels Read More
CropLife 100Wilbur-Ellis Acquires South Dakota Retailer
April 2, 2015
Wilbur-Ellis Co.’s Agribusiness Division, a recognized leader in precision agriculture technology and the distribution and marketing of plant protection, seed Read More
CropLife 100The McGregor Co. Closes Smith-Kem Acquisition
April 2, 2015
The McGregor Co. — ranked No. 16 on the CropLife 100 list of largest U.S. ag retailers — has completed Read More
CropLife 100BRANDT Commemorates National Ag Day
March 20, 2015
The Illinois agriculture community gathered at BRANDT global headquarters on March 18 to celebrate National Ag Day behind this year's theme Sustaining Future Generations. Read More
Latest News
Industry NewsCHS Insurance Names New Director Of Sales
April 17, 2015
Bryan Lewis has been named director of sales for CHS Insurance, the nation’s largest agribusiness insurance broker and full-service insurance Read More
Mature Waterhemp in Corn
HerbicidesGenetic Literacy Project: There’s No Such Thing A…
April 17, 2015
Read the latest “analysis” on GMOs from Consumer Reports and you’ll “learn” that glyphosate, the chemical developed by Monsanto (its Read More
HerbicidesNew Resistance To 2,4-D Discovered In Australia
April 17, 2015
In a world-first case of herbicide resistance, researchers have confirmed that sowthistle weed in the south east of South Australia Read More
ManagementNews From RTP Company Visits and Growers Buying Older S…
April 16, 2015
Paul Schrimpf and Eric Sfiligoj discuss recent trips to the Research Triangle Park area and market seed sales trends. Read More
soybean field
StewardshipNew ASABE Standard Establishes Framework For Sustainabl…
April 16, 2015
The American Society of Agricultural and Biological Engineers (ASABE) has initiated a project to develop a new standard to establish Read More
MicronutrientsSouthern States: An Inside Look At Our Tissue Sampling …
April 15, 2015
Remember learning about the food pyramid in school? The nutritional diagram recommends the proper amount of nutrients you need on Read More
Industry NewsArysta Adds New U.S. Fungicides Marketing Manager
April 15, 2015
Arysta LifeScience North America recently hired Deneen Sebastian as its Marketing Manager for U.S. Row Crops, Fungicides. Most recently, Sebastian Read More
FungicidesVerdesian Launches Phosphite-Based Cereal Fungicide
April 14, 2015
A new, phosphite-based fungicide designed for improved suppression of deoxynivalenol (DON) in wheat and barley infected by Fusarium head blight Read More
Mature Waterhemp in Corn
HerbicidesSURVEY: Close To 90% Of Growers Battle Weed Resistance
April 14, 2015
Herbicide resistance management continues to be a priority for corn and soybean growers, and they’re working together more effectively to Read More
CropLife 100Pinnacle Agriculture Acquires Minnesota Retailer
April 14, 2015
Pinnacle Agriculture Holdings, LLC, ranked No. 6 on the CropLife 100,  has successfully acquired Liebl Ag, LLC in Ada, MN.  Read More
StewardshipFMC Corp. Joins Sustainable Agriculture Alliance
April 14, 2015
FMC Corp. has joined Field to Market: The Alliance for Sustainable Agriculture, a multi-stakeholder initiative working to define, measure and Read More
Industry NewsArysta Adds Two To Goëmar Sales Team
April 14, 2015
Arysta LifeScience North America recently announced two new additions to the Goëmar sales team: Steve Kelly, Technical Service Manager – Read More
Valley Variable Rate Irrigation
Precision AgVariable Rate Irrigation Gains Followers
April 14, 2015
Irrigation systems have had the ability to apply different amounts of water throughout a field for decades, using timers that Read More
CropLife 100CHS, Aurora Cooperative Complete Fertilizer Storage, Gr…
April 13, 2015
CHS Inc., the nation’s leading cooperative and ranked No. 5 on the CropLife 100, and Aurora Cooperative (ranked No. 21) Read More
Soybean field
Industry NewsThree Ag Co-ops Poised For Possible Merger
April 13, 2015
Following months of study and preparations, the Board of Directors for United Farmers Coop (UFC), Farmers Elevator Cooperative (FEC) and Read More
Eric SfiligojAgriculture Braces For More Belt-Tightening
April 13, 2015
Spring is in full bloom across the U.S. and ag retailers and their grower-customers are busily getting into high gear. Read More
ManagementPollinator Health and Washington, DC
April 9, 2015
CropLife America’s Kellie Bray speaks with CropLife Editor Eric Sfiligoj regarding bee health and proposed Beltway regulations. Read More
InsecticidesValent Takes On MGK Insecticide Portfolio
April 9, 2015
As of April 1, Valent U.S.A. Corp. became the exclusive provider of the MGK crop protection line of insect control Read More