Garlic virus disease is an important disease that must be faced in garlic production, with high incidence in the field and complex and diverse manifestations. Therefore, it is often ignored by garlic farmers. There are more than 1 kinds of pathogens that infect garlic and cause virus diseases, such as leek yellow stripe virus, onion yellow dwarf virus, garlic common latent virus, onion latent virus, onion mite-borne latent virus, garlic mosaic virus, etc. In the field, garlic virus diseases are mostly caused by the compound infection of garlic by several viruses.
The symptoms of garlic virus disease The field manifestations of garlic virus disease are complex, and there are four main types. The diseased leaves are thin and thin, and intermittent yellow stripes appear along the veins. After the disease develops, they are connected into yellow-green stripes. The leaves are twisted, cracked and folded, the color of the leaves is pale and dull, the texture is stiff and brittle, the tip of the leaves is dry and atrophied, and many chlorosis spots and chloasma spots appear on the leaf sheath. The plant is obviously dwarfed and emaciated, the heart leaves stop growing, the root system is underdeveloped, the roots are short and the fibrous roots are reduced, which is yellow-brown. The plants do not bolting, or there are obvious yellow-brown patches on garlic bolts after bolting. The bulb of the diseased plant is smaller and the garlic cloves are reduced.
Occurrence conditions and transmission routes of garlic virus disease, garlic farmers keep garlic seeds themselves, which is an important cause of garlic virus disease. Poor soil, insufficient fertilizer, especially organic fertilizer, high cultivation density, malnutrition, late extraction of garlic bolts, false stem damage, and high temperature, serious aphids, continuous cropping or interplanting of garlic and leeks. Infected garlic virus disease strains can be directly transmitted to garlic bulbs after being infected with the virus. The pathogenic virus mainly survives in garlic bulbs and other garlic vegetables. All garlic with poisonous seeds when sowing will get sick after emergence. Pests such as aphids, red spiders and thrips allii are vectors of virus transmission.
garlic leaves rub against each other, which is also the way to spread garlic virus disease. The control method of garlic virus disease is virus-free garlic production seeds. On the one hand, professional institutions can carry out virus-free and rapid propagation of garlic seeds through garlic shoot tip culture combined with heat treatment. On the other hand, garlic farmers can directly choose excellent virus-free garlic varieties such as VF Xuan 1, VF Xuan 4, VF5, VF6, VF16, Shuangfeng No.1, Lu Suanwang No.1 and Bai Suanwang.