Broad‐bean stain and true broad‐bean mosaic viruses

SUMMARY Autumn‐sown crops of broad beans (Vicia faba L.) in England often contain plants with some leaves characteristically distorted and with a chlorotic mosaic. From some of these plants true broad‐bean mosaic virus was isolated in 1959 and 1960 but not in 1965 and 1966. From other plants a similar but distinct virus, which caused staining of the seeds and we call broad‐bean stain virus, was is…