Abstract
Thirty-three cowpea varieties were screened in a screen-house in Ibadan, Nigeria for responses to four cowpea viruses; namely, Bean common mosaic potyvirus - blackeye cowpea strain (BCMV-BlC), Cowpea aphid-borne mosaic potyvirus (CABMV), Cowpea Mottle Carmovirus (CMeV) and Southern bean mosaic sobemovirus (SBMV). 33 x 5 factorial experiment in completely randomised design was used, disease severity was measured at the second and sixth weeks after mechanical inoculation of the viruses and scored from 1 (no infection) to 5 (very severe infection). Symptomless plants were serologically tested with Protein – A sandwich enzyme linked immunosorbent assay (PAS-ELISA) to distinguish lines with latent infection from none infected lines. The yield in 2000 was not significantly (p KEY WORDS: Cowpea viruses, Disease incidence, Cowpea, Vigna, ELISA. Global Jnl Pure and Applied Sciences Vol.10(4) 2004: 473-478
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