How to prevent and cure white rust of asparagus?

How to control white rust of spinach? Please advise a 2 - 3 year rotation with other vegetable varieties. 2. before sowing, seed dressing and sterilization are carried out according to the proportion of 300g and 35% metalaxyl of 100kg seeds; 3. at the initial stage of disease, 6000 to 7000 times of 50% metalaxyl copper wettable powder is used, or 8000 times of 72.2% Pulick aqueous solution is sprayed, and once every 7 to 10 days can be used for prevention and control. reinfection. Rain and insects can also spread, and whether seeds can spread remains to be studied. Cold and wet night, warm day, heavy fog and wet soil conditions are conducive to the occurrence and epidemic of the disease. 3. Control method (1) Select disease-free seeds and seed treatment: select disease-free plots to keep seeds, soak newly bought seeds in warm water at 50℃ for 25 minutes, and sow after cooling. (II) Strengthen garden field management: select plots with high terrain, good drainage and ventilation for planting. Apply enough fertilizer and increase phosphorus and potassium fertilizer. Irrigate water reasonably, do not make onion land too wet. Discovered diseased plants, timely uproot buried. After harvesting, the diseased bodies are thoroughly removed, centralized treatment is carried out, and deep ploughing is carried out to reduce the bacterial source. (iii) Chemical control: At the initial stage of disease, spraying once every 7-10 days, spraying 3-4 times continuously, commonly used pesticides are 1:1:240-300 times of bordeaux mixture, 200-300 times of 40% of ethyl phosphorus aluminum wettable powder, 500-1000 times of 25% of metalaxyl wettable powder, 500-600 times of 75% of chlorothalonil wettable powder, 500-700 times of 65% of zineb wettable powder, 500 times of 64% of alum, 500 times of M8 wettable powder and 700-1000 times of 66.5% of Prolik aqueous solution. Click for more water spinach growing techniques Click for more vegetable growing techniques