Key Considerations for Southern Rust in Corn. "It's the earliest I've ever seen it," said University of Georgia Extension plant pathologist Bob Kemerait. As is normal, the issue generally starts in the southern most corn growing areas and then spreads to other areas on storm fronts and other weather patterns from June to August. If you suspect southern rust please send the samples to the Purdue Plant and Pest … Southern Corn Rust can occur in major regions for corn production in the US and Canada despite being a tropical disease. "New maps for tracking Southern rust in corn (repaired link)." Southern rust pustules are often numerous and tightly clustered in patches. With approaching weather this weekend, I advise growers in Deep South Central and deep Southeast Georgia to consider a fungicide application in their corn nearing tassel or beyond. Dry conditions will suppress the spread of southern rust as free moisture (dew or light rain) is necessary for spore germination and infection. This Spores are orange when they erupt from the pustule. Here is the current map of the progress of this disease on June 8, 2020. Department of Crop Sciences, University of Illinois at Urbana-Champaign, July 14, 2019. As pustules age, they become chocolate brown to black, often forming dark circles around the original pustule. Corn. A new system known as the “Integrated Pest Information Platform for Extension and Education,” iPiPE for short, is now being used to track southern rust of corn in the U.S. Southern Corn Rust Decatur Co. First email: “Received photo from consultant scouting corn in Decatur County yesterday; southern corn rust has just become established in that field. In the south most corn is past R3, but late planted fields should be carefully monitored. In the south most corn is past R3, but late planted fields should be carefully monitored. Issue 527: June 2020 Will Southern Corn Rust be an issue in 2020? Southern Corn Rust can occur in major regions for corn production in the US and Canada despite being a tropical disease. "It's widespread across the southern coastal area and it's early," Kemerait said. They may appear tan to orange in color. These observations come from university/Extension personnel in each state, as well as crop… Southern Rust: Southern rust was officially confirmed in our sentinel plots in Randolph County late last week, and since we have also confirmed in Whitley, Daviess, Jennings and Lawrence. Southern rust was prevalent at the Corteva Agriscience research station in Johnston, Iowa in 2017. Certainly more is to come. Embed code: Report Issues. Southern corn rust is on the move in the Corn Belt, as well as northern corn leaf blight and gray leaf spot. From Dr. Bob Kemerait: “Southern corn rust was found in Madison Co. FL yesterday just south of the Georgia line. See where it's causing damage by visiting our map. 1). Southern Corn Rust : This site contains two components: a real-time prediction map and an IPM Toolbox. Within a week, three other southern Georgia counties confirmed its presence. Common rust is caused by the fungus Puccinia sorghi and occurs every growing season. Established in 2 fields of corn; relatively new. As a member of the DTNPF online community you can contribute to discussions, save your settings, get exclusive email alerts and access to special online sections, and read e-newsletters. Rust pustules usually first appear in late June. Southern Corn Rust This fungus spreads from the tropical south to the colder north. The most reliable method for identifying corn rust diseases is based on examination of microscopic spore characteristics. Southern soybean growers are well trained to spray for soybean rust around the R3 growth stage when conditions favor the disease, but Midwest growers should be on alert, too. 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