How to prevent peony white peony disease
Peony white peony disease mainly occurs in the stem base of seedlings near the ground. Soil and fertilizer are the source of infection of this disease, especially when sweet potatoes and soybeans are the previous crops. Before and after flowering, high temperatures and rainy seasons are more likely to develop. In the early stage, there were no obvious symptoms on the ground. With the increase of temperature and humidity, the hyphae spread from the rhizome to the soil surface, and was covered with clouds around the rhizomes. Finally, brown miliary sclerotia were formed. The tip of the diseased plant withered, the leaves withered and drooping, and finally the whole plant withered.
Control methods:
1. It is not appropriate to work with crops of rhizomes and rotations of crops such as sweet potatoes, peanuts and broad beans.
2. Use disease-free seedlings and sterilize healthy seedlings. The disinfectant can be soaked for 5-30 minutes with 50% tumefax or 70% thiophanate-methyl or carbendazim 800-1000x.
3, in order to prevent the onset of seedling stage, 70% nitrochlorobenzene powder can be used to treat the soil, 2.5 kg per mu, add 50 kg dry fine soil, mix evenly, sprinkle in the sowing or cutting trench, and then sowing Or cutting. After planting, a new high-fat membrane was sprayed to isolate the pests and diseases and protect the plant's healthy growth.
4. The diseased plant was found to be dug out and burned in time, and the diseased point was disinfected with lime.
5. In the initial stage of disease, apply 70% of 50% nitrochlorobenzene powder in the nursery per acre, loosen the soil after application, and evenly mix the powder into the soil; also use 50% carbendazim WP 500 times or A 1% copper sulfate solution was poured into the roots.
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