1. Chair of Engineer Abdula Baqshan for Bee Research, Department of Plant Protection; Faculty of Food and Agriculture Science, King Saud University; Riyadh 11451 Saudi Arabia
2. Bonga Agricultural Research Center; P.O. Box 101, Bonga, Kaffa Ethiopia
3. 11 Grazingfield, Wilford Nottingham NG11 7FN U.K.
4. Department of Statistics; Rhodes University; P.O. Box 94, 6140 Grahamstown South Africa