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Mar 30, 2024Keywords:
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Main Article Content
Responses of Bi-Parental Mapping Population to Cassava Green Mite (CGM), Cassava Bacteria Blight (CBB) and Other Important Agronomic Traits
Abstract
Several biotic factors constrain cassava production in the cassava-cultivating regions of Africa. In Nigeria for instance, cassava bacterial blight (CBB) and cassava green mite (CGM) are among the major constraints that cause significant yield losses to cassava growers. Cost-effective mitigation measures for these constraints include adopting and using improved resistant varieties. In this study, 262 progenies derived from a bi-parental cross were evaluated at Otobi, Benue state Nigeria to determine their responses to CBB, CGM and other important constraints. The experiment was laid out in an alpha lattice design with two replications. Results revealed that CBB and CGM severity scores at 3, 6 and 9 months did not vary significantly among the assessed clones. However, CBB incidences at three and nine months varied significantly (p<0.05) among the genotypes. CGM incidence also varied significantly (p<0.01) among test genotypes. CBB mean severities ranged from 1.6 to 2.2, and the mean severity for CGM was 2.01. Plot-based broad-sense heritability estimates for CBB severity ranged from 0.01 to 0.04, while CBB incidence ranged from 0.08 to 0.11. The genotypes also differed markedly (p<0.001) for specific gravity and dry matter, with mean values of 1.12 and 35.3 respectively. After the assessment, twenty clones were selected using a non-weighted summation selection index for further screening. It is expected that the study will aid in the development of CBB and CGM-resistant/tolerant cassava genotypes, for cultivation in the guinea savanna region of Nigeria.
