Stalk rot is a common disease in peanut production in recent years. It is very common and the damage is relatively serious. Especially in the case of heavy ploughing, the occurrence is more serious. According to the survey, in 2004 in Dingzhou City, the average diseased plant rate was 15% to 20%, and the severe plant disease rate was more than 50%, causing the death of the entire plant, resulting in the lack of seedlings and ridges in the peanut field, directly affecting the peanut production. Should pay attention to. First, the onset of field symptoms at the seedling stage can cause the cotyledons to turn black and rot, and then invade the stem bases and underground stems near the ground. They are initially immersed in yellowish-brown lesions, and gradually grow around the stems to form dark brown patches on the rhizomes. On the ground, the leaf color became light yellow; the petiole was drooping at noon, the compound leaf was closed, and the early morning was restored; when the disease was severe, the whole plant was wilting and withered. Second, the incidence of conditions stem rot of peanut by the fungal infection of the genus of the genus of the genus. The pathogenic bacteria mainly thrive on peanut seeds or soil in the soil with hyphae and conidia, which is the source of infection in the coming year. In addition, manure is also a major source of bacteria. The spread of the field is mainly through watering or wind and rain. The pathogens mainly invade from the wounds of the rhizomes of plants, and the climate is suitable. Generally, symptoms occur in late May and reach the peak in mid-June. The second infestation peaks from late August to early September. Third, the cause of the disease: The main causes of this disease are the following: First, the continuous cropping of continuous cropping of grassland, the source of bacteria will be more serious. The second is the use of seeds to carry the disease, such as the seeds in the drying soaked by rain and mildew. The third is that the climatic conditions are suitable for propagation and spread of germs. If the temperature is moderate in May and June, if the humidity is high and there is more rain, the disease will spread seriously. Fourth, control measures 1. Selection of disease-resistant varieties. For example, Huaihua No.2, Huaihua No.4, Luhua No.11, Huayu No.17, Fenghua No.1 and so on. 2. Seed treatment before sowing. First, we must give priority to the use of high-quality seeds. Do not use seeds that are affected by mildew. Choose sunny weather before sowing and dry for 2 to 3 days to kill the disease and increase the rate of emergence. The second is the chemical seed dressing, the use of 2.5% of Shireshi seed dressing, 10 kg per 10 ml of seed dressing, the control effect of more than 80%. 3. Reasonable turn down. Can work with grass crops, vegetable crop rotation for 2 to 3 years, avoid continuous production for many years. 4. Chemical control. In the first flowering period of peanut, 50% of carbendazim 800 times solution + 80% of ethicillin 2000 times solution mixed spray is used; 25% of Blessing 1000 times solution is sprayed once a week for 2 to 3 consecutive times. For moderate and moderate land masses, prevention and control effects can be achieved. Heavy land masses can be combined with watering to prevent rooting.
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