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Cowpea (Vigna unguiculata (L. Walp) is one of the most important leguminous crop to mankind because of its use as food, soil cover and Nitrogen fixation. Despite this, viral diseases have been reported to be a major biotic constrain against cowpea production and can lead to total crop failure (100% yield loss). Field studies were conducted using 44 cowpea varieties laid down in Randomized Completely Block Design (RCBD) with three replications. There was a significant difference P ≤ 0.05 for disease incidence among cowpea genotype in both locations and for both seasons except for incidence in Minjibir 2021. IT17-1157-3-2 recorded the least disease incidence (7.33), while IT18KD-391 recorded the highest disease incidence (32.08). In total, six genotypes showed resistant response, twenty showed tolerant and the remaining eighteen genotypes showed susceptible response. In terms of location, BUK 2022 recorded the highest disease incidence (34.30%) while Minjibir 2021 had the least incidence (1.33%). The results of genetic variability indicated that there was a considerable variability response to cowpea aphid borne mosaic virus (CABMV) which to a larger extent is influenced by the environment, as evidenced by the higher environmental variance (EV), environmental coefficient of variation (ECV), and lower heritability values.
Nuraddeen et al. (Wed,) studied this question.
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