1. Phytochemical Research Unit, Richard B. Russell Agricultural Research Center, Agricultural Research Service, U.S. Department of Agriculture, P.O. Box 5677, Athens, GA 30613
2. Nematodes, Weeds and Crops Research, Coastal Plain Experiment Station, Agricultural Research Service, U.S. Department of Agriculture, Tifton, GA 31793
3. Western Cotton Research Laboratory, Agricultural Research Service, U.S. Department of Agriculture, Phoenix, AZ 85040
4. Floral & Nursery Plants Research Unit, Agricultural Research Service, U.S. Department of Agriculture, Beltsville, MD 20705-2350
5. Soybean & Alfalfa Research Laboratory, Agricultural Research Service, U.S. Department of Agriculture, Beltsville, MD 20705-2350
6. Crops Research Laboratory, Agricultural Research Service, U.S. Department of Agriculture, Oxford, NC 27565-1168