Performance and Improved Biofortified Varieties under Smallholder Conditions

Abstract

(Manihot esculenta Crantz) cornerstone security, nutrition, rural livelihoods in, where it provides a major of dietary energy millions of smallholder households. Despite its strategic importance, cassava productivity remains constrained by persistent biotic stresses, notably (CBSD), declining limited access to quality planting material and effective extension services. In response to these challenges, , has disseminated improved and biofortified cassava varieties, including provitamin A–rich yellow-fleshed clones, aimed at enhancing productivity, disease tolerance, nutritional quality.This study evaluated the agronomic performance, phytosanitary response, and farmers’ perceptions of selected improved and biofortified cassava varieties under smallholder farming conditions in villages surrounding the INERA Mvuazi Research Centre in western DRC. Agronomic measurements were conducted in farmers’ fields to assess yield components and dry matter content, while disease severity for cassava mosaic disease and CBSD was evaluated using standardized visual scoring methods. In parallel, structured farmer surveys were administered to capture perceptions of varietal performance, management constraints, and adoption dynamics.Results showed that all evaluated varieties exhibited satisfactory agronomic performance under farmer-managed conditions. Dry matter content ranged from 25.6% to 34.3%, indicating good suitability for consumption and processing. No statistically for most yield-related parameters. However, significant varietal differences were recorded for CBSD severity, with Ilona, Obama (TME 419), and Zizila demonstrating comparatively better tolerance. Farmers’ adoption levels varied markedly among villages, reflecting differences in access to planting material, extension support, and perceptions of production risks.The findings confirm the agronomic and nutritional potential of improved and biofortified cassava varieties in the DRC while underscoring the importance of farmer-centred dissemination strategies and strengthened agricultural extension systems to achieve sustained adoption and impact.