1. Graduate student and professor, respectively, Department of Food Science and Human Nutrition, and Center for Crops Utilization Research, Iowa State University, 2312 Food Science Building, Ames, IA 50011.
2. Professor, Department of Agronomy, Iowa State University.
3. Research geneticist, USDA-ARS, Corn Insects and Crop Genetics Research Unit, Department of Agronomy, Iowa State University.
4. Corresponding author. E-mail: pjwhite@iastate.edu Phone: 515/294-9688. Fax: 515/294-8181.