This afternoon, when I received a “sudden callâ€â€”an old man’s peanut had died a large part of it. We rushed to the ground to diagnose it. There is a layer of white material on the roots of the diseased plants. It is like wearing a pair of small white shoes. After observation and analysis, we are diagnosed with white tinea.
What are the factors associated with the occurrence of peanut white peony disease?
First, the climate factor. The occurrence of peanut white fungus is closely related to the natural climate and the microclimate in the field. The temperature determines the onset of the disease sooner or later, and the degree of humidity affects the severity of the disease. The optimum temperature for germination was 25°C to 35°C, the optimum air humidity was 90% to 100%, and the optimum soil moisture was 40% to 50%.
Second, management factors. Continuous cropping, larger groups, dense growth, poor ventilation and light transmission, many weeds, lodging of plants, poor soil, acidity, low depression, poor drainage, and high humidity in the field are all conducive to the occurrence of diseases. Rotation, moderate colony, no lodging, good permeability, energy irrigation, deep soil, organic matter, neutral alkali, strong growth, low weeds, clear diseased body, no tillage before winter The incidence of land is light.
What are the significant lesions of peanut after infection with tinea capitis?
At the early stage of disease, the diseased part became brown and soft rot, with corrugated lesions on it. The surface of lesions grew out of a layer of white silky mycelium, under suitable conditions mycelium spread to the lower stems of the plants, and spread between branches and between plants. The basal tissues of the affected stems were rotted and the cortex fell off, leaving fibrous tissue. The leaves of the diseased plants turned yellow and the edges scorch and finally withered and died. The infested stems and pods grew a lot of white mycelium and rotted and decayed.
What kind of prevention and control measures should be taken after peanut infection with TB?
The first is "three nets" preventive measures: (1) Elimination of bacteria source is clean. After the autumn, the diseased body is completely cleared of the field, leaving no residue, so as to eliminate the source of sterilization, and it can make the growth period not occur or late. (2) Soil disinfection. Combine plowing production with deep plowing soil between the rows and use 70% thiophanate-methyl or 40% methyllithium to 2–3 kg/mu. Add the fine soil and spread it in the soil to eliminate residual pathogens. (3) clean the pastoral. In the growing season of peanuts, diseased foliage or whole plants are removed in a timely manner, and the diseased bodies are burned to reduce the accumulation and spread of germs and control the rate and degree of epidemics.
The second is to conduct chemical control in a timely manner. In the early stages of peanut seedling spraying 20% ​​triadimefon EC 1000 times, or Park Hyde because of 1000 times, it can also be used in the initial stage of the disease with triadimefon, root rot spirit, thiophanate-methyl and other agents to root.
Since the Peanut’s peanuts have reached the end of the crop, we recommend him to take chemical control measures. At the same time, he also suggested that he should prevent and control the disease in advance and eliminate pathogens from the root to prevent huge losses in the later period.
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