Beet rhizomania in Southern Italy.
Rod-shaped virus particles c. 18 nm X 80-350 nm were consistently associated with sugar beet showing typical rhizomania symptoms. The virus was mechanically transmitted to herbaceous hosts. Polymyxa betae transmitted it from naturally infested soil to sugar beet seedlings. On treatment with a Japanese antiserum to beet necrotic yellow vein virus, the suspected pathogen of rhizomania in several countries, the virus particles were completely covered with antibodies.