Table 1.

Yam viral disease incidence and severity across four agro-ecological zones in Cameroon in 2014 and 2016

Agro-ecological zones	Farms surveyed			Mean incidence (%)				Mean severity (1–5 scale)
	2014	2016	Total	Range	2014	2016	Overall	Range	2014	2016	Overall
Zone II: high guinea savanna	12	19	31	0–56.7	30.0b	3.0b	13.4c	2–3.0	2.5ab	2.4b	2.4b
Zone III: western highlands	12	19	31	0–90.0	54.4a	32.8a	41.2a	2–4.1	2.6a	3.0a	2.8a
Zone IV: humid forest with monomodal rainfall	12	19	31	0–70.0	36.7ab	19.5a	26.1b	2–3.1	2.3b	2.6b	2.5b
Zone V: humid forest with bimodal rainfall	12	19	31	0–96.7	33.3b	20.2a	25.3bc	2–3.0	2.5ab	2.4b	2.5b
F	–			–	2.5	6.1	6.8	–	1.4	4.2	4.5
Total	48	76	124	–	–	–	–	–	–	–	–

Means followed by different letters within each column are significantly different from each other (Fisher’s LSD test, p < 0.05)