Ten yellow fleshed cassava genotypes with two checks were evaluated in a randomized complete block design with three replications at three locations. The combined analysis of variance across environments showed highly significant (P <0.01) mean squares (MS) for CMD among replicates; genotypes for RTNO, FRY and CMD; also among locations for FRY, CMD and CBB; genotypes by locations (G X E) only for root number. The mean from analysis of variance revealed that the yellow root cassava genotypes were statistically significant to CMD, CBB, CAD and CGM across locations. In terms of FRY and DM, Igbariam and Otobi perform better than Umudike. The highest means for DMC (37.02%) and FRY (28.02 t/ha) and lowest score for CMDS (1.00) was recorded at Igbariam. The biplot showed thatNR160012 had the highest mean yield followed by NR160014. NR160014 is the highest yielding and stable genotype; NR160012, though high yielding but was unstable while NR160017 was low yielding and unstable. The results also showed that all the genotypes were susceptible to CBB but moderately resistant to CMD. In terms of dry matter content, genotypes NR160041 (39.39%), NR160014 (40.15%), NR160032 (41.38%) and NR160027 (39.53%) were better while for fresh root yield, genotypes NR160023 (25.40 t/ha), NR160012 (46.75 t/ha) and NR160038 (39.60 t/ha) perform better across locations.
Keywords: Cassava, Evaluation, Genotypes, GGE, location.