Beet necrotic yellow vein virus

Beet necrotic yellow vein virus is a plant virus transmitted by the protozoan Polymyxa betae. Polymyxa forms highly resistant spores that can rest in soils for more than two decades.

Sugar beet
Proliferation of thin rootlets, and leads to a smaller tap root with reduced sugar content. Infected plants are less able to take up water, and wilting can be observed during the warm period of the year. If the infection spreads to the whole plant, vein yellowing (Not seen in the UK), necrosis and yellow spots appear on the leaves, giving the virus its name.

Prevention
Control measures include; cleaning soil from agricultural machinery after harvesting beets, avoiding the re-introduction to the farm of factory by-products, careful disposal of waste from seed processing and importing seed potatoes from rhizomania-free areas. Disease-tolerant sugar beet cultivars are widely used in affected regions.

Hosts
The disease effects Beta vulgaris subsp;
 * Sugar beet
 * Fodder beet
 * Beetroot
 * Mangolds,
 * Sea kale beet
 * Swiss Chard
 * Spinach