Symptoms and control methods of green onion seedling yellow dwarf disease
First, the disease pathogen:
The pathogen is called onion yellow dwarf virus and belongs to the potato Y virus family of the potato Y virus family. The host range is limited to allium crops. The virus is mainly adsorbed on the bulb or overwinter in the field with the diseased body. In the field, it is mainly transmitted by a variety of aphids, thrips, fleas, gray planthoppers, etc. in a non-persistent manner or juice rubbing. Less rain, high temperature and drought, insufficient fertilizer and water, extensive management, weak growth, and the adjacent crops of allium crops, as well as serious infections such as aphids and thrips, will aggravate the incidence of the disease.
Second, prevention and control measures:
1. Choose anti-viral disease varieties, do not raise seedlings or neighboring plants near the planting or planting fields.
2. Add fully decomposed organic fertilizer or organic-inorganic biological compound fertilizer containing humic acid, formulate according to the ratio of nitrogen, phosphorus and potassium 0.75:0.27:0.99 in the growth of green onion, and spray high potassium and nitrogen in time. Phosphorus and a variety of medium and trace elements of 40% gold power potassium, 55% Eurasian, etc., enhance plant disease resistance.
3. Drug spray prevention and control. 22% olefin·hydroxy·copper sulfate wettable powder 937 times liquid 33% morpholinium·azepine water 750 times solution 0.5% hydrazine (cucurbitine) solution 1500 times liquid spray. Or use 58.8% scorpion venom (aminophenol glucosamine hydroxy) WP 750 times solution 1.8% erfujima (avermectin special adjuvant) 750 times liquid spray. It can also be used 51.4% poison doctor (aminophenol·methyl ether·fragrance) wettable powder 750 times liquid 0.5% mad cockroach (cucurbitine) solution 750 times liquid spray control.
The website URL: Symptoms and prevention methods of green onion, seedling and yellow dwarf disease
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