Peony planting: what is the harm of peony powdery mildew?

What harm does peony powdery mildew have? How to prevent and cure the powdery mildew of peony? Please guide the harm of peony powdery mildew: there are white powdery mildew spots on the leaves, which are often expanded into pieces, or even cover the whole leaves and stems, causing premature senescence or death of the plant. The control methods of peony flower powdery mildew are as follows: 1. To strengthen the cultivation and management, the application of nitrogen fertilizer should not be too much, and potassium and calcium fertilizer should be applied appropriately to enhance plant growth and disease resistance. Timely pruning and plastic surgery, remove diseased shoots and diseased leaves, and improve ventilation and light transmission between plants. When potted indoors, it should be placed in a place with good ventilation and sufficient light. Control indoor temperature and humidity in winter and pay attention to ventilation at night. Before moving into the greenhouse (or cold cellar) in late autumn and early winter, you should check carefully and find that the diseased leaves and tips should be cut off and burned immediately so as not to spread indoors. 2. Spraying 1000-1500 times liquid of Bishi shark, 1000 times liquid of 15% trimethoprim wettable powder, or 1000 times solution of 70% methyl topiramate wettable powder at the initial stage of powdery mildew control have good control effect. The residual period of trimethoprim can reach 20-25 days. After spraying, the white layer of the diseased part is dark gray, dry and disappear. Click to get more peony planting techniques click to get more flower planting techniques