What are the control methods for onion viral disease?
How do you control onion viral disease? Please advise. The main onion diseases include yellow dwarf disease (viral disease), downy mildew, soft rot, gray mold and purple blotch. In recent years, onion viral disease has been a major disease in production. 1. Symptoms: it can occur during the seedling stage and the plant growth stage. After the plant is infected, the leaves become twisted, ...
How do you control onion viral disease? Please advise
The main onion diseases include yellow dwarf disease (viral disease), downy mildew, soft rot, gray mold and purple blotch. In recent years, onion viral disease has been a major disease in production.
1. Symptoms: it can occur during the seedling stage and the plant growth stage. After the plant is infected, the leaves become twisted, the leaf surface is uneven, with yellow mottling or long yellow streaks, and in severe cases the leaf cluster bends extremely, and the whole plant becomes stunted and shrivelled.
2. Disease conditions: the disease is more severe when there are many piercing-sucking insect pests.
3. Chemical control: begin spraying for prevention and treatment at the early stage of the disease. The pesticide is premium Jinbingdu (rimantadine hydrochloride, amantadine hydrochloride) at 1000-1500 times dilution for foliar spraying; after 7 days, spray once more, for 3 consecutive sprays. You can also use 1.5% Zhibingling (triacontanol, dodecyl sulfate, copper sulfate mixture) at 800 times dilution, or spray Bingdu Kuaike (moroxydine hydrochloride, iodine, ribavirin) at 1000 times dilution, using the same method as above.
4. Comparison of commonly used drugs: commonly used drugs on the market include amino-oligosaccharin, moroxydine hydrochloride, triacontanol, etc. Since viruses mutate the fastest in nature, a single ingredient is already very difficult for preventing the occurrence and spread of viral disease. Therefore, in actual production we should choose fungicides with multiple ingredients compounded, or new fungicides such as rimantadine hydrochloride and amantadine hydrochloride (medical drugs converted to agricultural use).
5. Precautions: viral disease is called the cancer of plants, which fully explains its characteristics of severe damage and difficult treatment. In particular, damage at the seedling stage often leads to total crop failure. Therefore, when diseased plants are found at the seedling stage, remove them promptly, and spray premium Jinbingdu in advance for prevention. At the same time, viral disease is mainly spread through contact and insects, so when treating viral disease it is necessary to combine it with insect control; only in this way can the root cause be addressed.
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