TRANSMISSION OF TOBACCO STREAK VIRUS IN RUBUS
Tobacco streak virus (TSV) was found to spread from infected plants into adjoining healthy, flowering blackberry plants (cultivar Boysen-72) at the rate of 8% per year over a six-year period. When similar Boysen plants were kept deflowered, the yearly infection rate was 4.5%. In parallel tests the spread of TSV into healthy, flowering 'Munger-70' black raspberry plants was found to be 25% per year, compared with 9% in deflowered plants. The importance of flowers in the spread of TSV in these Rubus cultivars is evident from these data; these results also show that an additional method of spread exists which is not related to the presence of flowers.
Converse, R.H. (1980). TRANSMISSION OF TOBACCO STREAK VIRUS IN RUBUS. Acta Hortic. 95, 53-62