Beet necrotic yellow vein virus

Beet necrotic yellow vein virus (BNYVV) is a plant virus, transmitted by the protozoan Polymyxa betae (initially thought to be a fungus)). Polymyxa forms highly resistant spores that can rest in soils for more than two decades. The virus can rest in these spores, and when the spores germinate into mobile zoospores, they transmit the virus to the plant.