Powdery mildew of chrysanthemum needs to be treated

From late August to October, chrysanthemum powdery mildew often occurs, which can lead to poor plant growth, leaf death, or even no flowering, which needs timely control. In cultivation, pay attention to cut off the dense and yellow branches and leaves, pull out the diseased plants, clean up the diseased leaves and fallen leaves, and burn them or bury them deeply. Planting should not be too dense, control soil moisture, increase ventilation and light transmission, and increase the application of phosphorus and potassium fertilizer to enhance plant disease resistance. Avoid applying too much nitrogen fertilizer. The basin soil or seedbed soil was sprayed and disinfected with 50% thiophanate methyl and 50% thiophanate at 1:1 and diluted at 600ml / 700 times. At the initial stage of the disease, it was sprayed with 1000 times of 50% Garinon wettable powder or 75% 13 morpholine emulsion, once every 10 days, 3 times in a row. When the disease is serious, spray with 1500 times of 15% trimethoprim emulsion or 800ml 1000 times of 70 methyl topiramate wettable powder, once every 7 mi 10 days, for 4 times in a row.