Three comoviruses isolated from diseased bean plants in Brazil (CV-BZ), Venezuela (CV-VZ), and Honduras (CV-HD) were inoculated to 53 bean genotypes possessing or lacking the dominant alleles of the necrosis (I) gene, which conditions resistance to bean common mosaic virus (BCMV). These comoviruses systemically infected all bean genotypes tested, predominantly inducing mosaic and plant malformation. Symptom expression was considerably enhanced in bean cultivars possessing the dominant I gene, particularly when infected by CV-VZ and CV-HD (.)