Gil Gullickson . View Count: 29. Tennessee Corn: Southern Rust Present, Low Incidence, Severity Jul 27, 2020 Jul 27, 2020 This past week samples from Chester, Lauderdale, and Montgomery Counties in Tennessee were confirmed to have southern corn rust, so the question is do you need to put out a […] That's in spite of the dry conditions that persist in parts of Nebraska and Iowa. The speed at which corn rust can reach damaging levels is why it is necessary to pay careful attention to the level and timing of initial disease infection in susceptible hybrids. Southern Rust of Corn Found in North Dakota (09/10/20) — Crop & Pest Report Although the majority of corn hybrids lack adequate resistance to Southern rust, there are a couple hybrids that can be planted in parts of Illinois that have decent resistance to this disease. Common rust prefers cooler weather (61-77°F), while southern rust is favored by warmer temperatures (77-82°F). ... Southern rust being found in corn at VT/R1 in South Dakota at this time is the earliest in the last seven years. Southern rust has is also confirmed on corn in Arkansas, Georgia, Illinois, Kansas, Kentucky, Mississippi, Missouri, Nebraska, Oklahoma, Tennessee, and Texas. Share. Southern rust is caused by a fungal pathogen that does not overwinter in Illinois. Description: Nebraska Extension Plant Pathologist Tamra Jackson-Ziems gives an update on corn diseases and what producers should be looking for in their fields. Illinois Corn Growers Association; However, being able to predict yield loss due to defoliators such as foliar plant diseases and insects that progressively increase in defoliation over time has been difficult to quantify. All corn plants have age-related resistance to the rust fungi, and plant-ing corn as early as possible can minimize disease risk later in the season, because leaves will typically be more mature and less susceptible to infection when rust spores arrive from the South. Common rust is caused by the fungus Puccinia sorghi and occurs every growing season. Southern rust also favors high temperatures, ranging from 80 to 90-plus degrees Fahrenheit, in addition to areas with high humidity and moisture stress. Young leaves are more susceptible to rust … In this video of BASF’s Plant Health Series 2020, John Schultz discusses considerations for southern rust in corn. Common and southern rust are foliar pathogens of corn, but unlike gray leaf spot and northern corn leaf blight, they do not overwinter in northern areas and are instead blown on wind currents. Southern rust can be differentiated from common rust by the color and the arrangement of the pustules on the leaf. Southern rust has now been detected in Kansas and Nebraska (Figure 1). It is seldom profitable to treat corn for southern rust, except when the disease arrives early or when it infects susceptible seedcorn inbreds, sweet corn, and popcorn. Southern corn rust. From Dr. Bob Kemerait: “Southern corn rust was found in Madison Co. FL yesterday just south of the Georgia line. It poses a greater threat than common rust due to its ability to rapidly develop and spread under favorable conditions. Because southern rust is a wind-borne fungus, it has potential to be a wide-spread problem for growers. July 20, 2020 July 20, 2020 By Tamra Jackson-Ziems and Jenny Rees, University of Nebraska-Lincoln Extension Specialists. 7/20/2020. Common rust prefers cooler weather (61-77°F), while southern rust is favored by warmer temperatures (77-82°F). Email. The increased prevalence of southern rust in the Corn Belt makes it important for growers to be able to distinguish it from common rust. Share. ... 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