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. Department of Entomology, North Carolina State University, Raleigh, NC 27695
3. Crops Research Laboratory, Agricultural Research Service, U.S. Department of Agriculture, P.O. Box 1555, Oxford, NC 27565
4. Nematodes, Weeds and Crops Research, Coastal Plain Experiment Station, Agricultural Research Service, U.S. Department of Agriculture, P.O. Box 748, Tifton, GA 31793