Recently, in the continuous wet and humid weather around Xiaogan, downy mildew has occurred in many Chinese cabbages. How do the experts currently use the medicine?
The downy mildew of Chinese cabbage is a fungal disease. It can be endangered all year round in warm areas. The average temperature is easy to be epidemic at about 16°C, and high humidity and raininess are beneficial to the disease. The cotyledon of the Chinese cabbage is most susceptible and the true leaves are more resistant to disease. The leaves of the vegetable strain begin to age and enter the stage of disease induction, and they mostly develop in the late stage of growth. The humidity in the greenhouse is high, the temperature is suitable, and diseases are more likely to occur. The main damage to the leaves, flowers and seed pods.
The prevention and control of cabbage downy mildew, it is best to take comprehensive measures to prevent and control.
1 Agricultural measures: Strengthen management of water and fertilizer, apply basic fertilizer, and increase phosphorus and potassium fertilizers. Take sorghum cultivation. Small water ground irrigation, timely drainage after rain. After harvesting, diseased leaves and diseased plants should be removed from the field and buried deep or burned, and deep-turning the soil can reduce the spread of germs in the fields. Nursery attention to ventilation.
2 Seed Disinfection: 75% Chlorothalonium WP or 25% Metalaxyl WP before seeding, seed dressing at 0.3% seed weight.
3 Pharmacy control: When the central diseased plant should be sprayed and protected in time, the back of the old leaf should be sprayed. Rainy days should continue spraying after 5-7 days. It is possible to use 64% oxaprozin WP 500 times, or 75% chlorothalonil WP 500 times, 20% thiophanate-methyl suspension 1000-1300 times, 150 million live spores, or Trichoderma gram Wettable powder 200-300 times, 40% triethylphosphonate aluminum wettable powder 150-200 times liquid, 58% metalaxyl manganese zinc wettable powder 500 times liquid, 72.2% dry mildew water agent 600-700 times Liquid, 78% Wave Manganese Zinc Wettable Powder 500x, 69% Dimethomorph Morpho Manganese Zinc Wettable Powder 600x Liquid, 50% Amethyst Copper Wettable Powder 600x, 72% Cyanuricum Manganese Zinc Moistenability Powder 700 times liquid, 52.5% oxaclofenac cream, urea cyanide water dispersible granules 1500 times, 25% metalaxyl WP 800 times liquid and other sprays, 6-7 days once, continuous prevention and treatment 2-3 times You can.
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