It finally arrived.
Soybean rust was positively identified for the first time Oct 3 in a two southeast Nebraska soybean fields.
Identification was confirmed at the University of Nebraska-Lincoln Plant and Pest Diagnostic Clinic and the National Plant Diagnostic Network regional hub lab at Kansas State University on Oct. 5.
The disease was found on soybeans in southeastern Richardson County near the town of Rulo and in Otoe County south of Nebraska City. Leaf samples were collected from scouting activity by Seth Watson, UNL soybean rust sentinel plot coordinator. Samples of hundreds of leaves were collected as part of scouting activity with the national soybean rust sentinel plot system. The sentinel plot system is funded by the Soybean checkoff program and USDA.
The discovery in Nebraska was not unexpected.
"Based on where other reports of soybean rust had been confirmed in recent days in southern Kansas and near Des Moines, Iowa, we thought it should be here," says Loren Giesler, UNL plant pathologist.
The disease has been found in many states this year and has been moving north from its overwintering location in the Gulf States and spread into Texas earlier this summer.
UNL specialists are working to determine if other fields in the state also have rust.
"Fortunately for soybean producers this year, the disease is showing up too late for any impact on yield, and management will not be needed," Giesler says.
Had rust occurred earlier in the year, a totally different scenario could have developed, Giesler says.
Updates on where soybean rust has been confirmed in Nebraska and other parts of the U.S. can be found on the USDA soybean rust Web site at http://sbrusa.net.
"As mentioned, no management will be needed this year for soybean rust in Nebraska, but growers should continue to stay aware of where soybean rust is being found in future years," Giesler says "Each year the disease has spread north and west earlier, and this year we have observed a totally different distribution compared to last year.
If rust arrives earlier in the season in future years, management options will include fungicide application, but once the crop reaches the R6 growth stage (full berry stage), the impact of soybean rust is minimal and most fungicides cannot be applied based on the minimum pre-harvest intervals. Producers are encouraged to contact a local UNL Extension office for more information on soybean rust, call the soybean rust phone hotline at (877) NEB-RUST or visit UNL's soybean rust Web site at http://soybeanrust.unl.edu.