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Occurrence and Control of Powdery Mildew in Dutch
First, the damage symptoms mainly damage the leaves, but also harm the stems and pods. Leaves suffer, the leaves begin to produce white powdery yellow spots, and then gradually expand into irregular spots, and meet each other, the lesions covered with a layer of white powder, severe leaves yellow. Damage to stems and stems, stems shrink, yellow, and pods shrink and shrink. Second, prevention and control technology 1. Agricultural control. Rotation in the affected areas; selection of more resistant and disease-prone varieties; full base fertilizer, application of phosphorus and potassium fertilizers; scientific watering, flooding should not be flooded; strengthen ventilation, reduce humidity. 2. Biological control. In the early stage of disease, use 2% agricultural anti-BO-10 water agent or agricultural anti-120 water agent 200 times liquid, spray 1 time every 7 days (T), spray 2-3 times. 3. Physical control. In the early stage of disease, use 27% high-fat film emulsion 80-100 times liquid, once every 6 days (days), spray 2-3 times. 4. Chemical control. 1 Spray liquid. At the beginning of the disease, spray 45% sulfur rubber suspension 300-400 times solution or 15% triadimefon (triadimefon) WP 800-1000 times, spray once every 7 days (days), and spray 2-3 times. 2 smoked. Before the onset of disease, 45% chlorothalonil smoke can be used, 200g-250g per 667m2 each time, in the evening, 4-5 points, and smoking 3-4 times. 3 spray baking soda. The disease just happened. Only when individual plants had 1-2 small spots, spraying 500 times of baking soda, once every 3 days (days), even spraying 4-5 times, not only preventing powdery mildew, but also decomposing carbon dioxide and increasing production. .