PFBV infection is limited to Pelargonium species and cultivars. Cultivars vary in susceptibility; PFBV is the most common virus infection of the florist's geranium (P. x hortorum). The virus is transmitted from geranium to geranium by sap inoculation, contaminated tools, surface contaminated pollen, thrips in the presence of infected pollen, and recirculating nutrient solutions. It is not transmitted by aphids or seed. Geraniums have been freed of PBFV by heat (35º C) treatment; however, plants are severely stressed by this treatment. Once virus free plant material is obtained, it is propagated in a clean stock program (culture indexing). There no cures or chemical treatments for plant viruses. Buy culture indexed plants and cuttings. Discard infected material.