1. Biological Control of Pests Research Unit, USDA, Agricultural Research Service , Stoneville, MS 38776 , USA
2. Mycotoxin Prevention and Applied Microbiology Research Unit, National Center for Agricultural Utilization Research, USDA, Agricultural Research Service , Peoria, IL 61604 , USA
3. Southern Insect Management Research Unit, USDA, Agricultural Research Service , Stoneville, MS 38776 , USA
4. Department of Medicinal Chemistry, College of Pharmacy, University of Minnesota , Minneapolis, MN 55455 , USA