Beet necrotic yellow vein virus
Beet necrotic yellow vein virus ( BNYVV ) is a plant virus , transmitted by the plasmodiophorid "Polymyxa betae . " The BNYVV is a member of the genus "Benyvirus" and is responsible for rhizomania , a disease of sugar beet ( Rhizo: root; Mania: madness ) that causes proliferation of thin rootlets , and leads to a smaller tap root with reduced sugar content . 
<triplet> Beet necrotic yellow vein virus <subj> Benyvirus <obj> parent taxon