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A study was carried out to evaluate the interactive effects of rhizobium and virus inocula on three cowpea cultivars: Ife brown, Owode and IT90K-277-2 on sterilized soils in the greenhouse. The cultivars were inoculated with two strains of rhizobium, R25B and IRj2180A, and two strains of virus, cowpea aphid-borne mosaic virus (CABMV) and cowpea yellow mosaic virus (CYMV), 7 days after planting (DAP) regarded as early inoculation and 21 DAP as late inoculation. The trial was a factorial experiment fitted into split-split plot design. Viral inoculation significantly reduced the numbers of nodules and nodule weight, biomass production and grain yields of all the three cowpea cultivars. Maximum reductions were obtained with the viral infections where rhizobium inoculants were absent. Time of inoculation also had a significant impact on the effect of the inoculums strains. Early inoculation provided a significant result than late. The interaction of rhizobium and virus inoculums strains indicated that the severity of infection by the viral strain was not in any way depressed by the presence of rhizobium inoculums strains. There were no variations in varietal reactions. Cultivar IT90K-277-2 possessed a superior genotype while Ife brown cultivar exhibited the least performance in terms of most parameters measured.

Interactive Effects Of Rhizobium And Virus Inocula On Symptomatology And Nodulation In Cowpea