How to prevent and cure onion virus disease?

How to prevent and cure onion virus disease? Please guide that the main diseases of onion are yellow dwarf disease (virus disease), downy mildew, soft rot, gray mold and purple spot. Onion virus disease is the main disease in production in recent years. 1. Symptoms: both seedling stage and plant growth period can occur. After the plant was infected, the leaves were twisted and uneven, with yellow mottled or long yellow stripes, and when the leaves were extremely curved, the whole plant was dwarfed and shrunk. 2. Disease conditions: the disease of piercing and sucking pests is more serious. 3. Drug prevention and treatment: spray prevention and treatment at the initial stage of the disease. The medicine is foliar spray with 1000-1500 times solution of fine gold virus (amantadine hydrochloride and amantadine hydrochloride). Spray once every 7 days, three times in a row. You can also use 1.5% Zhanling (triacontanol, dodecyl sulfuric acid, copper sulfate mixture) 800x solution, or spray virus quick gram (morpholine guanidine hydrochloride, iodine, triazole nucleoside) 1000 times solution spray, the method is the same as before. 4. Comparison of commonly used drugs: the commonly used drugs on the market are aminooligosaccharins, morpholine guanidine hydrochloride, triacontanol and so on. Because the virus mutates most rapidly in nature, it is difficult for a single component to prevent the occurrence and prevalence of virus diseases. Therefore, we actually produce traditional Chinese medicine using fungicides with multiple ingredients. Or new fungicides such as amantadine hydrochloride, amantadine hydrochloride (medical drugs converted to agriculture) 5, Note: virus disease is called plant cancer, which fully illustrates the characteristics of its serious harm and difficult treatment, especially the damage in the seedling stage often leads to crop failure, so the diseased plants found in the seedling stage are removed in time, and the fine gold virus is sprayed in advance to prevent it. At the same time, viral disease is mainly spread through contact with insects, so the treatment of viral disease should be combined with insecticidal, so that we can get to the root of the problem. Click to get more onion planting techniques click to get more vegetable planting techniques