Evaluation of Cassava Genotypes for Agronomic Performance, Correlation with CMD and CBSD Parameters and Stability across Alupe, Kakamega and Kibos in Western Kenya

Main Article Content

L. N. Navangi
S. M. Githiri
E. M. Ateka
E. Kanju
T. L. Munga
S. Tumwegamire
R. M. Otsyula
P. O. Kwena
V. W. Woyengo
J. Malinga
L. O. Okitoi

Abstract

Cassava (Manihot esculenta Crantz) production in sub-Saharan Africa (SSA) is constrained by the two biotic constraints namely, cassava mosaic disease (CMD) and cassava brown streak disease (CBSD). The aim of this study was to evaluate elite cassava genotypes for variation in agronomical traits, correlate them to CMD and CBSD parameters and identify stable genotypes in Alupe, Kakamega and Kibos in Western Kenya. Twenty three (23) elite cassava genotypes that had shown resistance to either one or both of CMD and CBSD in Eastern Africa were evaluated. The trial was conducted using an alpha lattice balanced design with twenty three (23) genotypes, replicated three times at Alupe, Kakamega and Kibos in Western Kenya for an extended cropping cycle between 2016 and 2017. Results showed significant differences (P ≤ 0.05) between genotypes and location (or agro-ecology), but not interaction (P ≥ 0.05), for all the agronomic performance parameters evaluated. All the 23 cassava genotypes evaluated across the three locations had mean cyanide potential levels ranging from of 3.00–6.00 and were therefore, sweet and not bitter. The significant but negative relationship between CMD and CBSD incidence and severity with agronomic performance implied that their relationship was inverse. Confirmation of stability for agronomic performance was achieved through AMMI analysis, using AMMI stability value (ASV). Stable genotypes based on AMMI stability values (ASV) for fresh root yield across Alupe, Kakamega and Kibos were KBH/2002/066, Kibandameno (a local standard check), NASE-18, Kizimbani and NASE-3. These genotypes need to be further evaluated in more environments to assess their wider adaptability and stability.

Keywords:
Manihot esculenta, agronomic traits, AMMI, CMD, CBSD, correlation, stability.

Article Details

How to Cite
Navangi, L. N., Githiri, S. M., Ateka, E. M., Kanju, E., Munga, T. L., Tumwegamire, S., Otsyula, R. M., Kwena, P. O., Woyengo, V. W., Malinga, J., & Okitoi, L. O. (2020). Evaluation of Cassava Genotypes for Agronomic Performance, Correlation with CMD and CBSD Parameters and Stability across Alupe, Kakamega and Kibos in Western Kenya. Journal of Experimental Agriculture International, 42(2), 47-62. https://doi.org/10.9734/jeai/2020/v42i230469
Section
Original Research Article

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