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Cowpea cultivars Early Ramshorn and Dixie Queen, reported to be resistant to cucumber mosaic virus (CMV) by Sinclair and Walker in 1955, were reexamined for the existence of individual CMV-resistant genotypes within seedling populations. CMV-inoculated populations of these two cultivars became CMV-infected at rates of 60% and 80%, respectively, as determined by DAS-ELISA. CMV-free plants were grown to maturity, seeds from these sources were planted, and second-generation seedlings were inoculated again with CMV. Rates at which these seedlings became CMV-infected were 10% and 24%, respectively. The complementary 90% and 76% of these populations remained completely free of ELISA-detectable CMV and were saved to maturity. Evaluations of third-generation populations are being performed. Twenty additional cultivars and breeding lines also are being evaluated. Seedlings of 14 of the 22 cultivars/lines became 95% to 100% infected when inoculated with CMV. Results from eight of the 22 suggested that seedling populations contain CMV-susceptible and -resistant plants. Near isogeneic sublines of susceptible and resistant plants per cultivar/line are being conveyed to cowpea breeders for genetic analyses and breeding purposes.

HIDDEN RESISTANCE TO CUCUMBER MOSAIC VIRUS IN HETEROGENEOUS POPULATIONS OF COWPEA (VIGNA UNGUICULATA) LINES AND CULTIVARS