1. Agronomy Dep.; Univ. of Florida; P.O. Box 110500 Gainesville FL 32611
2. Council for Scientific and Industrial Research-Savanna Agricultural Research Inst. Nyankpala; P. O. Box TL 52 Tamale Ghana
3. Univ. of Ouagadougou; P.O. Box 03 B.P. 7021 Ouagadougou Burkina Faso
4. Texas A&M AgriLife Research and Dep. of Plant and Soil Sciences; Texas Tech. Univ.; 1102 East FM 1294 Lubbock TX 79403
5. Agronomy Dep.; Univ. of Florida, NFREC; Mariana FL 32446
6. Dep. of Entomology; North Carolina State Univ.; Box 7613 Raleigh NC 27695
7. Dep. of Crop Science; North Carolina State Univ.; Box 7620 Raleigh NC 27695