Figure 16. (A) Various types of maps depicting average temperatures in December, January and February can be used as a guideline to determine areas where Stewart's wilt is a potential problem. The area in the Midwest where Stewart's wilt has the potential of being a problem in a particular year (i.e., the area south of each line) is depicted by a map showing the approximate northern boundary for an average winter temperature of -3° C (28°F). (B) A more detailed weather map generated by the NOAA Climate Prediction Center was used by Gustafson Inc. to predict areas where Stewart's wilt had the potential to be severe in 2002. (Courtesy K. Arthur, Gustafson LLC, copyright-free) BACK