Peony planting: how to prevent and cure peony white silk disease?

How to prevent and cure peony white silk disease? What harm does peony white silk disease have? Please introduce the harm of peony white silk disease: click to open the link. Peony white silk disease mainly occurs at the base of the stem near the ground of the seedling. At the beginning, the cortex of the diseased part turned brown, gradually developed around, and produced white silk-like hyphae in the diseased part, which fanned and spread to the nearby soil surface, and later formed rapeseed-like tea-brown sclerotia on the basal surface or on the mycelium layer of the soil surface. After the seedling was infected, the cortex of the stem base and root rotted, the transport of water and nutrients of the plant was cut off, the leaves turned yellow and withered, and the whole plant withered. The prevention and control methods of peony white silk disease are as follows: 1. When selecting disease-free seedlings to transport seedlings, strictly check, eliminate diseased seedlings, and disinfect healthy seedlings. 2. The disinfectant can be soaked in 70% thiophanate methyl or carbendazim 800 × 1000 times, 2% lime water, 0.5% copper sulfate solution for 10 minutes. 2. In order to prevent the disease at the seedling stage, 70% pentachloronitrobenzene powder can be used to treat the soil, 250 grams per 67 square meters, add 5 kilograms of dry fine soil, mix evenly, sprinkle it in the sowing or cutting ditch, and then sow or cut. After planting, the new high-fat membrane was sprayed to isolate diseases and insect pests and protect the healthy growth of plants. 3. After the symptoms appear in the aboveground part of the tree body in spring and autumn, the soil near the main root of the trunk can be removed to dry, which can restrain the development of the disease. The time of root drying can be carried out from early spring to March to autumn until the leaves fall, and the tree holes can be filled before the rainy season to prevent adverse effects. When drying the roots, we should also pay attention to building a ridge around the hole to prevent water from flowing into the hole. 4. In the early stage of the disease, 70% pentachloronitrobenzene powder can be sprinkled on the soil surface in the nursery, 250 grams per 67 square meters, loosen the soil after application, so that the powder can be evenly mixed into the soil; 50% carbendazim wettable powder 500 times solution, or 50% thiophanate wettable powder 500 times solution, or 1% copper sulfate solution, irrigate the roots of seedlings, and spray new high-fat film at the same time to control the spread of the disease. 5. After the diseased tree treatment determines that the root is sick according to the symptoms of the aboveground part of the tree body, peel off the soil at the base of the tree trunk to find the disease site, after the disease is diagnosed as white silk disease, scrape off the disease spot on the root neck thoroughly with a knife, and disinfect the wound with 1% sulfuric acid solution. Then smear the healing film to prevent the infection of rot bacteria, protect the wound tissue healing, and then cover the new soil. And dig isolation ditch around the diseased plant, dig isolation ditch, seal off the disease area. Click to get more peony planting techniques click to get more flower planting techniques