Prevention and treatment of common onion diseases

Onion common diseases include brown spot, soft rot, yellow dwarf, anthracnose, etc., and vegetable farmers to identify and control.

First, onion brown spot

Onion brown leaf spot, also known as tip verticillium wilt, is mainly harmful to the leaves, and the diseased leaves are easy to start from the upper part. The initial spot is water-soaked yellow-brown spots, followed by fusiform lesions, generally 10-30 mm long and 3-6 wide. In millimeters, the middle part of the spot is gray-brown and brown on the edge. It is easy to produce black dots on the surface of the plaque, that is, the ascospora shell. In severe cases, several lesions merge, resulting in partial dryness of the leaves.

Control methods: (1) Use high-temperature white varieties, tri-leafed Qi, chicken onions, Zhangqiu green onions and other heat-resistant varieties. (2) Strengthen management, timely drainage after rain, prevent over-wetting of onion fields, increase vitality of root system, and increase resistance to disease. (3) In the early stage of onset, spray 50% speeding wettable powder or acetaminophen wettable powder 1000 times, 50% carbendazim wettable powder 800 times or 70% thiophanate-methyl wettable powder 1000 times. Liquid, plus 75% chlorothalonil WP 800 times, spray every 7 to 10 days, and even spray 2 or 3 times.

Second, onion soft rot

Bacterial soft rot of green onions has increased year by year. It generally extends from the base of the stem upwards and downwards. The initial infestation is a water-stained elongated spot, followed by a translucent grayish-white lesion. The base of the leaf sheath then softens and decays, causing the leaves to fold down, the lesions to expand downward, and the pseudostem. At the beginning of the disease, it was immersed in water, and the interior began to rot, emitting a stench characteristic of the bacterial disease.

Control methods: (1) Increase organic fertilizer and cultivate strong seedlings. Transplanting in proper period, diligently cultivating, shallow watering, increasing phosphorus and potash fertilizers to prevent excessive nitrogen fertilizer. (2) Prevent and control underground pests and above-ground pests in time to reduce human wounds. (3) Chemical control. At the beginning of the disease, 77% of WP can be used to kill 500 times, 72% of streptomycin sulfate powder 2000 times, and 14% of collaborative amine copper powder 250 times. According to the condition, it is sprayed once every 7-10 days. Even spray 2 or 3 times.

Third, onion yellow dwarf

Onion yellow dwarf disease, also known as welsh onion virus disease, scallion from the seedling stage to the adult can get the disease, the diseased plant growth was blocked, the blade uneven, shrinking and twisting, thin leaves, tip gradually yellowing, sometimes on the leaves Yellow-white streaks of varying lengths or yellow-green mottled. Severely dwarfed strains were severed, the leaves were distorted and flattened, growth was stopped, waxiness was reduced, and the leaves drooped yellow. In severe cases, the whole plant was shriveled to death.

Control methods: (1) Agricultural control. Before planting onions, weeds are removed from the field, diseased seedlings are removed, fertilizer and watering are applied at appropriate times, and attention is not paid to neighboring other onion and Garlic crops. (2) Timely control of locusts and thrips. (3) Increase organic fertilizers, apply topdressing at appropriate times, spray plant growth regulators, and increase resistance to disease. (4) In the initial stage of the disease, spray 1.5% of the plant disease and disease emulsion 800 times solution or 20% of the virus A WP 500 times, prevent it once every 5 to 7 days, and control 2 or 3 times.

Four, onion anthrax

Harmful leaves, stems and pseudo-stems. The early infestation of the leaves was nearly spindle-shaped, spindle-to-irregular, pale gray-brown to brown, and many black spots appeared on the spots, namely the conidia discs of the pathogens, which caused severe death of the upper leaves. Years of rainy weather have long been accompanied by rain and rain, and poorly-drained low-lying land has become more severe.

Control methods: generally use 80% anthrax Fumei WP 800 times or 70% thiophanate-methyl 1000 times or 70% of 600 times Dasheng 600 times in the initial spraying control.

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