Question: The master of the farm road at Nanma Village Yongnian County, Handan City, sent a message from Weicun, said that the cabbage plants in its two sheds appeared frosty mildew. The first time was a water-stained spot. After being expanded, it was limited by veins and was polygonal, and the leaves gradually became yellow and dry. . When the humidity is high in the field, there is a white frosty mildew on the back spot. Ask what is this disease, how to prevent it?
Wang Guiren A: Initially identified as downy mildew.
Cabbage downy mildew is the main disease of Chinese cabbage in spring. The disease is long, and the damage is serious. The lighter person reduces the yield by 10% to 20%, and the weight is more than 30%. In recent years, with the rapid development of cabbage in the protected area, the disease has occurred. It is also getting worse.
First, the symptoms
Cabbage downy mildew is a common fungal disease in spring shed cabbage and occurs mainly on the leaves. Under high temperature conditions, the diseased part often has near-circular lesions. In severe cases, white molds are also produced on stems and petioles, and seedlings and leaves die. The leaves were initially tainted with pale yellow-brown spots on the leaves and gradually expanded. Due to the limitation of the veins, they became polygonal or irregular. The white spots on the back of the lesions turned brown. When the air is wet, the condition develops rapidly, and finally the leaves turn yellow and dry.
Second, prevention and control measures
1. Agricultural control: Select disease-resistant varieties, remove the diseased leaves completely after harvest, and try to rotate with non-cruciferous vegetables such as tomatoes and beans.
2. Biological control: Spray 2% pyrimidine nucleoside antibacterial agent 200 times before onset (in the cotyledon stage and mid- and late-balloon stage), spray once every 7 days, and spray 2 or 3 times. Or with bio-preventive preparation 150 million live spores / g Trichoderma WP powder 267 grams per mu 50 liters spray, spray every 5 to 7 days.
3. Chemical control: In the early stage of disease, 50% enoylmorpholine wettable powder 1500 times, 25% pyraclostrobin cream 2500 times, 64%?f cream MnZn(antivirus) wettable powder 600～800 Times of liquid, 72% frost urea manganese zinc (glucose) 600 to 800 times the liquid, the incidence of seedling period can be used 20 grams / muscularius oligopsis foliar spray, spray focused on the back of the white mold layer, once every 7 days , continuous 3 to 4 times.
4. Chemical control: When the disease is severe or when a central diseased plant occurs, 75% chlorothalonil WP can be used 600 times, or 64% zearaze WP 500 times, 58% metalaxyl Zn can be used. Wet powder 500 times, 78% MnZn wettable powder 600 times, 72.2% Propomosulfide 800 times, 68% refined metalaxyl wettable powder 1000 times, 50% Dimethomorph WP 1000 times, 52.5% oxazolone urea cyanide water dispersible granules 2000 to 3000 times, 25% enefluenol EC 23000 times, 25% azoxystrobin suspension 1000 times, 70% propylsen Zinc wettable powder 700 times liquid and other agents, the whole plant spray control, every 7 to 10 days once, continuous control 2 to 3 times.
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