1. Natural Products Utilization Research Unit; Agricultural Research Service; U.S. Department of Agriculture; P.O. Box 1848 University Mississippi 38677 USA
2. National Center for Natural Products Research; The University of Mississippi; University Mississippi 38677 USA
3. Mosquito and Fly Research Unit; Center for Medical, Agricultural and Veterinary Entomology; 1600 S.W. 23rd Drive Gainesville Florida 32608 USA
4. Nematology Laboratory; Agricultural Research Service; Henry A. Wallace Beltsville Agricultural Research Center - West; U.S. Department of Agriculture; Beltsville Maryland 20705 USA