1. Fisher Delta Research Center Univ. of Missouri 147 State Hwy T Portageville MO 63873 USA
2. Division of Plant Sciences Univ. of Missouri Columbia MO 65211 USA
3. Dep. of Crop and Soil Sciences Univ. of Georgia Athens GA 30602 USA
4. College of Agricultural Sciences Southern Illinois Univ. Carbondale IL 62901 USA
5. USDA, Agricultural Research Service, Crop Genetics Research Unit Stoneville MS 38776 USA
6. USDA, Agricultural Research Service Crop Genetics Research Unit Jackson TN 38301 USA
7. Dep. of Plant Pathology Univ. of Arkansas Fayetteville AR 72701 USA