How can you prevent cabbage white rust?

How can you prevent cabbage white rust? Please guide crop rotation with other vegetable varieties for 2-3 years. The disease-free seeds were selected and the seeds were treated. The newly bought seeds were soaked in 50 ℃ warm water for 25 minutes, and then sowed after cooling. Before sowing, seed dressing and sterilization was carried out according to the proportion of 300g metalaxyl in 100kg seeds; at the initial stage of the disease, 72.2% pric water was sprayed with 8000 times liquid, and once every 7 days and 10 days. The field management selects plots with high terrain, good drainage and ventilation for planting. Apply enough fertilizer and increase the application of phosphorus and potassium fertilizer. Irrigate properly so as not to make the land too wet. If you find a diseased plant, remove it and bury it in time. After harvest, the disease and residue were thoroughly removed, concentrated treatment, and deep ploughing was carried out to reduce the source of bacteria. At the initial stage of chemical control, spray once every 7 to 10 days, for 3 times in a row. The commonly used medicaments are 1-40% Bordeaux solution, 40% ethyl phosphate-aluminum wettable powder 200-fold, 300 times, and so on. Click to get more asparagus planting techniques click to get more vegetable planting techniques