Southern Rust has been found in corn in several southern Indiana Counties.
The Daviess County Purdue Extension Office reports that the disease caused by a fungus has been detected in Pike, Dubois, Orange, Warrick and Perry Counties. It’s also been discovered in Clay, Parke, Jennings, Shelby, Decatur, Jennings and Bartholomew Counties.
Experts say the detection is of concern because it’s come earlier than normal and there are many acres of late planted or re-planted corn this year that have the potential to be impacted by the disease. But, that all depends on weather.
Southern rust can be a damaging disease. Foliar fungicide can help protect plants from infection and disease development. However, it is important to consider corn growth stage AND weather conditions before deciding on a fungicide application. If the weather is hot, (mid-80s and above), humid, and there are heavy dews and rainfall, then southern rust may develop and spread more quickly. Cooler, less humid weather will cause the disease to develop and spread slowly.
Yield potential should also be a consideration, and high-yield potential fields should be prioritized when making management decisions. Farmers trying to decide if a fungicide application is warranted can scout fields carefully and frequently and watch the weather to determine if and when a fungicide application is needed.
