1. International Centre of Insect Physiology and Ecology (ICIPE) P.O. Box 30772 Nairobi 00100 Kenya
2. Center for Development Research (ZEF) University of Bonn 53113 Bonn Germany
3. Texas A & M University Kingsville Citrus Center, 312 N. International Blvd. Weslaco TX 78599 USA