Assessment of farmers' field for root rot disease on improved cassava varieties released in Nigeria

More cassava is grown in Nigeria than anywhere else, but production is still limited by several factors including root rot disease which is common in cassava growing areas. A survey was carried out to assess farmers’ fields for yield and root rot disease on cassava varieties in seven States of Nigeria. Field assessment was based on 5 m by 5 m quadrats in two locations within a plot by counting the number of plant stands, total number of fresh roots, number of rotted roots, and weight of fresh roots within the quadrat. Across States and within varieties there were signiicant differences (P