1. Faculty of Agricultural Sciences; University of Lubumbashi (UNILU); B.P. 1825 Lubumbashi Democratic Republic of Congo
2. Postgraduate School of Agriculture and Rural Development; University of Pretoria; Private Bag X20 Pretoria Hatfield 0028 South Africa
3. Landscape Ecology and Plant Production Systems Research Group; Free University of Brussels (ULB); 50 Avenue F.D. Roosevelt CP 169, B-1050 Brussels Belgium
4. International Centre of Insect Physiology and Ecology (icipe); P.O. Box 30772-00100 Nairobi Kenya