1. Plant Virus Department, Leibniz Institute DSMZ-German Collection of Microorganisms and Cell Cultures, 38124 Braunschweig, Germany
2. International Institute of Tropical Agriculture (IITA), Dar es Salaam P.O. Box 3444, Tanzania
3. Tanzania Agricultural Research Institute, TARI Ukiriguru, Mwanza P.O. Box 1433, Tanzania
4. International Institute of Tropical Agriculture (IITA), Kalambo Bukavu P.O. Box 4163, Democratic Republic of the Congo
5. Association Volontaire pour le Développement (AVPD), Karenzu, Luvungi, Itara 1, Democratic Republic of the Congo