Statistical analysis of the incidence—plants in symptom classes 2–5—of the disease by ecozones revealed significant differences (Table 1): disease incidence was lower in the FSM zone than in the SGS and the SS of Benin. Nevertheless, 36% of infected plants (classes 2–5) in the FSM zone showed dieback symptoms (class 5). In the NGS, CBB incidence was lower than in the SGS (P=0.087) and the SS (P=0.075). The incidence was 100% in large governmental cassava multiplication farms in North Benin.