|Authors: ||D.J. Barbara, A. Morton, V.H. Knight|
|Keywords: ||Loganberry, PCR-RFLPs, RB-isolates, Rubus idaeus, ‘Tayberry’.|
Raspberry bushy dwarf virus (RBDV) can cause severe crop losses in raspberries but in England and Wales was virtually eliminated from this crop by the use of resistant cultivars.
Most cultivars now being widely grown are not resistant, leading to the possibility of a resurgence of the virus.
Serological surveys carried out in 1995-7 have shown that RBDV now occurs frequently in red raspberry and hybrid berries in England and Wales.
Approximately one-sixth of all plots of Rubus material tested had some infection and approximately one-quarter of all farms sampled had at least one plot with some infection.
Some plots of all the four cultivars most widely grown in 1995-7 were infected.
Molecular studies suggested that at least 15 distinct genotypes of the virus occur.
The distribution of those genotypes suggest that two separate outbreaks are occurring: (i) of the two most common genotypes spreading between commercial farms in the two major raspberry growing areas, possibly coming from infected hybrid berries; (ii) of the less common genotypes as scattered infections from local sources with little spread between farms.
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