1. Dep. of Crop Sciences, 1201 W. Gregory Dr. Univ. of Illinois Urbana IL 61801 USA
2. USDA-ARS, Soybean/Maize Germplasm, Pathology, and Genetics Research Unit, Dep. of Crop Sciences, 1101 W. Peabody Dr. Univ. of Illinois Urbana IL 61801 USA
3. Ecole Supérieure d'Agriculture de Purpan 75 voie du TOEC 31076 Toulouse Cédex 03 France