Anicet Sindayihebura, University of Burundi, Burundi; Sam Ottoy, KU Leuven, Belgium; M Sendegeya, S Ntiharirizwa, M Kataraza, N Nsengiyumva, D Kubwimana, University of Burundi, Burundi; C Nizigiyimana, Institut des Sciences Agronomiques du Burundi (ISABU), Burundi; S Ndihokubwayo, E Duhawenimana, A Cubahiro, P Nkurunziza, L Nahimana, University of Burundi, Burundi; T Declerck, University of Liège, Belgium; Christophe Metsu, KU Leuven, Belgium; Romy Schlögel, University of Liège, Belgium; G Nimpagaritse, Royal Museum for Central Africa, Burundi; Eric Pirard, University of Liège, Belgium; Jos Van Orshoven, KU Leuven, Belgium