OYDV - Onion Yellow Dwarf Resistant Onions

OYDV - Onion Yellow Dwarf Resistant Onions. Type: Virus - Potyviridae. Yellow Dwarf is a virus disease that affects the growth of garlic, onions, and shallots. It was first discovered in Pleasant Valley, Iowa, adjacent to the Mississippi River, in June of 1927. Although the virus is not spread to the seeds, seeds from infected plants are of poor quality. Symptoms of yellow dwarf include yellow streaks and complete yellowing at the base of the true first leaves. The leaves are usually crinkled, twisted, and flattened, and usually fall over. The plants will be wilted and dwarf, and the bulbs are usually underdeveloped and do not reach full size. The virus is spread by aphids. Controlling aphids does not prevent the disease, as they quickly transmit the virus as they move through the field and infect the crop. Use onion seeds rather than onion sets. The best option is to use disease-resistant varieties.