- In recent growing seasons, southern rust has occurred further north in the Midwestern U.S. earlier in the season than has been historically typical for this disease.
- There have been confirmed detections in several counties in Indiana, Illinois, Iowa, Nebraska, and Kansas and even some cases in South Dakota and Wisconsin (Figure 2).
- The increased prevalence of southern rust in the Corn Belt makes proper identification of this pathogen especially important.
Figure 2. Confirmed detections of southern rust in corn through the first week of September during the 2017 and 2018 growing seasons. (Source: http://www.ipipe.org).
Southern rust symptoms visible in the upper canopy of corn in Johnston, Iowa (Sept. 11, 2017). Foliar disease was extensive but infection occurred late enough in the growing season in this instance that yield impact was likely minimal.