Tulip mosaic virus Lily streak virus The Tulip breaking virus is one of five plant viruses of the family Potyviridae that cause color-breaking of tulip flowers. These viruses infect only two genera of plants: Tulipa (tulips) and Lilium (lilies), (family Liliaceae). Tulip-breaking virus (TBV), Tulip top-breaking virus (TTBV), Tulip bandbreaking vir...