The most important data on the history, statutes and structure of ICTV are presented in connection with the earlier published data on taxonomy of plant viruses. The most important rules of virus classification are briefly commented. The content of the ICTV 7th Report is summarized: the species concept in virology, ICTV database, the classification of plant viruses within the whole virus taxonomy system and the formal status of ICTV.
This paper reviewed current literature concerning the problem of rhizomania disease caused by Beet necrotic yellow vein virus (BNYVV, Benyvirus). At present, it is considered as a serious problem in almost all sugar beet growing regions of the world. Some details conceming virus taxonomy and compositions of BNYVV genome, virus transmission and disease spreading as well as the methods of virus detection and control of rhizomania disease are described. In Poland the occurrence of the BNYVV, especially due to favorable conditions for its vector Polymyxa betae can still make sugar beet production uneconomic. Taking into consideration the first report about considerable lasses the most urgent task is to restrain the spread of rhizomania.