Prevention of spinach wilt and downy mildew

Prevention of spinach wilt

Spinach wilt generally occurs in the adult stage. The performance of the old leaves darkens and loses luster. The mesophyll gradually yellows and gradually expands upwards. When the downward development progresses, the roots turn brown and die. Early onset plants were significantly dwarfed. When the weather is dry and the temperature is high, the diseased plants quickly become chlorotic. In damp, low-temperature conditions, diseased plants can continue to survive for a period of time, sometimes producing new lateral roots. However, in the event of hot weather, it quickly died.

Fusarium oxysporum f. sp. tritici mainly grows and overwinters in the soil or seeds with the plant disease. The seeds can be borne, and the unfermented manure can also be carried. Bacteria spread with rainwater and irrigation water and invade directly from the wound or root of the root, and can reach the vascular bundle after invading. In vascular bundles, germs produce toxic substances that block the catheter and cause the leaves to dying. High temperature and humidity are conducive to disease; soil temperature is around 30 degrees Celsius, soil moisture, fertilizer is not fully decomposed, many underground pests, nematodes are more susceptible to disease.

Control methods: 1, to avoid continuous cropping; 2, the application of adequate decomposition of organic fertilizer, and the use of formula fertilization technology to improve the resistance of plants; 3, the use of sorghum or ridge cultivation, timely drainage after the rain, non-big flooding irrigation; 4 , found that the central diseased plants were removed in a timely manner, the diseased point and around the spray 50% carbendazim WP 800 times, or 10% Zhiweiling agent 300-400 times the liquid, spray once every 15 days, continuous 2-3 Times.

Prevention of Downy Mildew in Spinach

Downy mildew is one of the main diseases of spinach. It mainly damages the leaves, the lesions are yellowish, irregular in shape, and have different sizes and edges. After the lesions were enlarged, they were connected to each other and the plants became brown and dead later in the disease. A grayish purple mold layer develops on the lesion on the back of the leaf. The disease gradually developed from the outer leaves to the inner leaves and expanded upward from the lower part of the plants. During the drought, the diseased leaves were yellow, and when the humidity was high, they were rotted. The severe leaves of the entire plant turned yellow and died.

Prevention:

1, strengthen the cultivation and management. Science irrigation, reduce the humidity in the field.

2. Select disease-resistant tip leaf type varieties.

3. The seeds of the disease can be borne by bacteria and should be collected on disease-free or disease-free plants. Before sowing, use 50% thiram for wettable powder and use 0.4% of seed weight.

4. When the diseased plant is found, it must be removed promptly and brought out of the field.

5. In the early stage of onset, spray 40% EB aluminum wettable powder 200-250 times, or 58% metalaxyl, or 64% antivirus WP 500 times, spray once every 7-10 days, continuous 2 -3 times.

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