New natural weed host Raphanus raphanistrum L. (Brassicaceae) for Beet necrotic yellow vein virus and its vector Polymyxa betae Keskin

Rhizomania is an important virus disease of sugar beet (Beta vulgaris) caused by Beet necrotic yellow vein virus (BNYVV). The virus is transmitted to the roots of host plants by the plasmodiophorid Polymyxa betae. During survey studies in September and October 2009.