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

CropLife 100Two Iowa-Based Ag Co-ops To Merge
August 27, 2014
The Board of Directors and management of United Western Coop, Missouri Valley, IA has completed a merger with Heartland Co-op, West Des Moines, IA, effective September 1, 2014. Read More
MAGIE 2014 ShowStopper
EquipmentJohn Deere Again Wins MAGIE ShowStopper Award
August 25, 2014
For the second consecutive year, John Deere was honored at the Midwest AG Industries Exposition (MAGIE) for its new R4045 sprayer. Read More
Eric SfiligojMAGIE 2014: A ShowStopping Event
August 8, 2014
The kick-off to the summer show season, Midwest AG Industries Exposition (MAGIE), takes place next week in Bloomington, IL. Read More
EmployeesAsmark Institute Dedicates New Training Center To Ford West
August 6, 2014
The Asmark Institute plans to recognize the retired industry leader's years of service to the fertilizer industry at the new state-of-the-art facility in Owensboro, KY. Read More

Trending Articles

ManagementExpert To Discuss Farmland Value, Rent At Farm Science Review
August 18, 2014
While cropland values in Ohio increased in the past two years, they have remained flat in 2014, declining in some cases, according to an Ohio State University agricultural economist. Read More
EquipmentAdvance Your Technology IQ At MAGIE
August 13, 2014
The Midwest AG Industries Exposition (August 20-21) is the place you need to be to see, study and evaluate how new advances in the equipment, operations, crop protection and fertility sectors can help your business prosper. Read More
HerbicidesScouting Key To Next Season’s Soybean Herbicide Program
August 12, 2014
When growing soybeans, growers need to think ahead to stay one step ahead of weeds. That means examining weed threats and evaluating which herbicides work best. Read More
StewardshipMichigan Agriculture Leaders On Toledo Water Ban: We Want To Be Part Of The Conversation
August 8, 2014
Leaders of Michigan agricultural organizations said Thursday that the government should not have a “knee-jerk reaction” based on last weekend’s water ban in Toledo due to fertilizer run-off in Lake Erie. Read More
CropLife 100BRANDT Acquires Lemon Ag Services
August 4, 2014
The acquisition of Lemon Ag fits BRANDT’s aggressive corporate strategy of providing superior agronomic advice and services for customers in central Illinois. Read More
Eric SfiligojThe Resurgence Of Crop Protection
August 4, 2014
Plenty of new offerings over the next few years should see a rebirth for the crop protection products category in terms of market share. Read More

Latest News

Webinars5 Key Benefits Of Attending A Webinar
September 2, 2014
Webinars can provide ag retailers with a convenient option for gaining knowledge on the latest industry issues and solutions. Read More
Crop InputsBASF Is Betting On A Bright Agricultural Future
September 1, 2014
The crop protection products giant is gearing up for a busy time in agriculture by investing in both product production and development over the next couple of years. Read More
Eric SfiligojAn Erie Feeling For Ag
September 1, 2014
Plenty of water issues have been in the news lately, including the continuing drought in California. Read More
CropLife 100Pinnacle Acquires California-Based Retailer
August 29, 2014
Pinnacle Agriculture Holdings will acquire Kerman Ag Resources, Inc., which will operate under Pinnacle's Performance Agriculture brand. Read More
Allied Cooperative Grain Plant
ManagementArcadia Co-op To Merge With Allied Cooperative
August 28, 2014
Allied Cooperative has announced that members of Arcadia Co-op voted in favor of a merger with Allied Cooperative, paving the way for the consolidation which will be effective on December 1, 2014. Read More
InsecticidesBioinsecticide VENERATE Now Registered In California
August 27, 2014
Marrone Bio Innovations' VENERATE is a new tool to help California growers control crop-damaging insect pests, fight the development of insect resistance and reduce pesticide residues on fruits and vegetables. Read More
CropLife 100Two Iowa-Based Ag Co-ops To Merge
August 27, 2014
The Board of Directors and management of United Western Coop, Missouri Valley, IA has completed a merger with Heartland Co-op, West Des Moines, IA, effective September 1, 2014. Read More
FertilizerKoch Expands AGROTAIN Nitrogen Stabilizer Portfolio
August 26, 2014
Koch Agronomic Services, LLC has added two new innovative nitrogen stabilizers to the AGROTAIN product family – AGROTAIN ADVANCED and AGROTAIN DRI-­MAXX. Read More
Seed/BiotechDuPont To Build Two Seed Treatment Centers
August 26, 2014
DuPont has announced construction on two state-of-the-art centers dedicated to developing and testing seed treatment formulations, applications and seed handling techniques in an important step toward bringing new solutions to growers. Read More
Seed/BiotechLoveland Products Acquires A Controlling Interest In Ag…
August 26, 2014
Loveland Products, a subsidiary of Agrium , has announced the company has acquired a controlling interest in Agricen, a Dallas-area agricultural biotechnology company delivering biochemical-based products for efficient and sustainable plant nutrition. Read More
StewardshipUp Close Look At The 2014 Environmental Respect Award W…
August 25, 2014
The 2014 Environmental Respect Award winners were honored recently at the 24th annual event in Wilmington, DE. Read More
Eric SfiligojAg Science Rejection Carries Consequences
August 25, 2014
As innuendo and fear dog the regulatory process, agriculture can’t get the new tools it needs to combat world hunger. Read More
LegislationFarmers Dismayed As New Farm Bill Dumps Direct Payments
August 25, 2014
The threatened end of cash subsidies to the nation’s row crop farmers dates back through at least the last two iterations of national agriculture policy legislation. Read More
MAGIE 2014 ShowStopper
EquipmentJohn Deere Again Wins MAGIE ShowStopper Award
August 25, 2014
For the second consecutive year, John Deere was honored at the Midwest AG Industries Exposition (MAGIE) for its new R4045 sprayer. Read More
CropLife 100GROWMARK CEO To Retire
August 22, 2014
GROWMARK chief executive officer Jeff Solberg has announced his retirement effective September 15, 2014. Read More
InsecticidesDuPont’s Prevathon Approved For Dry Beans
August 22, 2014
DuPont Prevathon insect control powered by Rynaxypyr has received EPA registration for foliar use on dry bean crops, including dried shelled peas and beans. Read More
ManagementNCGA DuPont New Leaders Program Enters Sophmore Season
August 20, 2014
The National Corn Growers Association and DuPont are pleased to announce the second year of the NCGA DuPont New Leaders Program. Read More
FungicidesVerdesian Links Up With Mitsui, Hokusan
August 20, 2014
Mitsui Chemicals Agro, Inc., and Hokusan Co., announced the signing of an exclusive licensing agreement allowing Verdesian Life Sciences global access to its patented technology for suppressing mycotoxin contamination in wheat and barley. Read More