1. Royal Holloway University of London, Surrey TW20 0EX Egham United Kingdom
2. International Institute of Tropical Agriculture PMB 5320 Ibadan Nigeria
3. International Potato Center, La Molina CP 1558 Lima Peru
4. Bioversity International Parc Scientifique Agropolis II 34397 Montpellier France
5. Laboratory of Tropical Crop Improvement Division of Crop Biotechnics KU Leuven B‐3001 Leuven Belgium
6. Bioversity International Willem De Croylaan 42 B‐3001 Leuven Belgium
7. International Institute of Tropical Agriculture. C/0 The Nelson Mandela African Institution of Science and Technology P.O. Box 44 Arusha Tanzania
8. International Center for Tropical Agriculture CP 763537 Cali Colombia