First, the law of occurrence
1. The pathogen of capsicum root rot is Fusarium solani. In the soil can survive for more than 10 years, the spread of channels mainly depends on fertilizer, farm implements, rainwater and running water.
2. The occurrence of root rot in pepper is closely related to temperature. 22-26°C is most suitable for onset. The incidence of more than 30 °C is below 2%.
3. The greater the humidity of the root rot of pepper, the heavier the disease. Flooding flooding disease, heavy water, small water pouring disease incidence.
Second, the symptoms
Root rot of pepper occurs after colonization. At the early stage of onset, the leaves and leaves of the diseased plants, especially the top leaves, were slightly wilted and recovered from early evening to early morning. Symptoms were repeated several days later. The leaves were all wilting but the leaves were green; the roots and roots of the diseased plants were pale brown and dark brown. Rotting, easy peeling, exposing the xylem; observation of the transverse stems, visible microtubules turn brown, visible later diseased Minister of the white to pink mold layer (disease conidia).
Third, prevention and treatment
1, rotation for change. According to the long-lived pathogenic bacteria in the soil, it is necessary to carry out more than 5 years of crop rotation with Chinese cabbage, cabbage, garlic, welsh onion and other crops, which is an important cultivation condition to reduce or eliminate root rot of pepper.
2, eliminate the initial dip source. To solve the breeding problem of cultivated peppers, in general, the pepper seedlings should be solved by themselves. If special circumstances require the purchase of seedlings, they must not be purchased in the diseased area to effectively prevent the spread of root rot caused by the purchase of seedlings.
3, scientific management, prevent stagnant water. During the site preparation, one should dig a drainage ditch. The ridge planting and the ridge planting are two lines, which is conducive to early ridge sealing, which is conducive to ventilation and lighting and field management; the use of adequately decomposed organic fertilizers; the middle and late stage dressing, the use of prepared compound fertilizer The mother liquor is poured when watering, or watered after submerged in the ridge to prevent the human management from causing root damage.
4. Isolation of diseased fields. If one or a few strains are found in the field of pepper, wilting at noon and recovering slightly at night, they should be immediately removed, brought out of the field and burned, and then buried in the vicinity of the pepper plant with lime, followed by the closure of the whole field.
5, strengthen the cultivation and management. According to the survey, the cultivation of high-riding ridges on the same plot is significantly lighter than that of low-ridge cultivation; Therefore, high ridge cultivation and covering with plastic film. Irrigation should be reasonable. Do not flood irrigation, conditions can be drip irrigation to keep the soil semi-dry semi-dry state, timely application of phosphorus and potassium fertilizers to enhance resistance to disease.
6, pharmaceutical control. Disinfect the soil during planting, and then perform chemical prevention after easing the seedlings. Apply 50% carbendazim WP 500 times or 50% thiophanate-methyl WP 500 times during the initial stage of the disease to prevent and treat the disease in time.
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