Susceptibility of red raspberry varieties to raspberry bushy dwarf virus and its genetic control

Summary Red raspberry varieties known to be susceptible to raspberry bushy dwarf virus (RBDV) are listed. Experiments at East Malling suggest that some varieties previously thought to be immune to RBDV are not so although they are difficult to inoculate by grafting. Additional varieties tested may possibly be immune. The response of varieties derived from Lloyd George and segregation in progenies derived from resistant varieties suggest that the genetic control of susceptibility may be by dominant complementary genes.