First, the law of occurrence
1. The pathogen of capsicum root rot is Fusarium solani. It can survive in the soil for more than 10 years. The transmission channels mainly rely on fertilizer, tools, rain, and flowing water.
2. The occurrence of root rot of pepper is closely related to the temperature, 22°C～26°C is most suitable for onset.
3. The greater the humidity, the heavier the incidence of root rot of pepper, the incidence of flooding with heavy irrigation, and the incidence of light water pouring.
Second, the symptoms of root rot of pepper occurred after planting. At the early stage of disease, the branches and leaves of the diseased plants, especially the top leaves, were slightly wilted and recovered from early evening to the next morning. After repeated symptoms for several days, the leaves were all wilting, but the leaves were still green. The rhizomes and roots of the diseased plants were light brown and dark brown rot. They were easily peeled off to expose the xylem. The observation of the transverse stems revealed that the vascular bundles turned brown and the diseased minister showed white to pink moldy layers in the late wet period.
Third, prevention and treatment
1. Change the rotation. With cabbage, cabbage, garlic, green onions and other crops for more than 5 years of rotation.
2. Put an end to the initial infection source. In general, the pepper seedlings must be cultivated by themselves. If it is necessary to purchase 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 to prevent stagnant water. During the site preparation, one has to dig a drainage ditch; in the ridge planting, a 90-cm-wide high ridge is made, and a ridge is planted in two rows, which is conducive to early ridge closure, which is conducive to ventilation and lighting and field management; the use of adequately decomposed organic fertilizers, In the late stage, fertilizer is prepared by pouring the prepared mother liquor with watering, or watering the plants after spreading them in order to prevent man-made management from causing root damage.
4. Treatment of diseased plants. If one or a few strains are found in the pepper field and wilting occurs at noon, and they recover slightly at night, they should be immediately removed and brought out of the field to burn off. Then, lime cavities should be buried with lime.
5. Strengthen cultivation management. According to the survey, the cultivation of high-riding ridges on the same plot is significantly lighter than that in low-ridge cultivation, and the disease is lightly covered with plastic membranes. Therefore, it is recommended that growers should grow on high ridges and cover them with plastic films. Do not flood irrigation, conditions can be drip irrigation to keep the soil semi-dry state, timely increase in phosphorus and potassium fertilizers to enhance resistance to disease.
6. Chemical control. (1) Immerse the roots with 900 times liquid of anti-Kangling wettable powder or 300 times liquid of hymexazide wettable powder for 10 to 15 minutes during colonization. (2) After planting the seedlings, the rooting agent should be strengthened by 800 times the wettable powder of Xiangnong 4 before the onset of disease, and the roots of the peppers should be irrigated every 7 to 10 days for 3 to 4 consecutive times. (3) When watering after planting, add copper sulphate into the field with water. The dosage per acre is 1.5-2 kg, which can reduce the incidence. (4) Spraying or irrigating with an agent at the early stage of the disease, such as 50% carbendazim WP 500 times, 50% thiophanate-methyl WP 500 times, 75% dexcone WP 800 times, etc. Mu spray liquid 50 liters, sprayed about 10 days 1 time, continuous spray 2 to 3 times, 3 days before fruit picking to stop the medication.
1. The pathogen of capsicum root rot is Fusarium solani. It can survive in the soil for more than 10 years. The transmission channels mainly rely on fertilizer, tools, rain, and flowing water.
2. The occurrence of root rot of pepper is closely related to the temperature, 22°C～26°C is most suitable for onset.
3. The greater the humidity, the heavier the incidence of root rot of pepper, the incidence of flooding with heavy irrigation, and the incidence of light water pouring.
Second, the symptoms of root rot of pepper occurred after planting. At the early stage of disease, the branches and leaves of the diseased plants, especially the top leaves, were slightly wilted and recovered from early evening to the next morning. After repeated symptoms for several days, the leaves were all wilting, but the leaves were still green. The rhizomes and roots of the diseased plants were light brown and dark brown rot. They were easily peeled off to expose the xylem. The observation of the transverse stems revealed that the vascular bundles turned brown and the diseased minister showed white to pink moldy layers in the late wet period.
Third, prevention and treatment
1. Change the rotation. With cabbage, cabbage, garlic, green onions and other crops for more than 5 years of rotation.
2. Put an end to the initial infection source. In general, the pepper seedlings must be cultivated by themselves. If it is necessary to purchase 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 to prevent stagnant water. During the site preparation, one has to dig a drainage ditch; in the ridge planting, a 90-cm-wide high ridge is made, and a ridge is planted in two rows, which is conducive to early ridge closure, which is conducive to ventilation and lighting and field management; the use of adequately decomposed organic fertilizers, In the late stage, fertilizer is prepared by pouring the prepared mother liquor with watering, or watering the plants after spreading them in order to prevent man-made management from causing root damage.
4. Treatment of diseased plants. If one or a few strains are found in the pepper field and wilting occurs at noon, and they recover slightly at night, they should be immediately removed and brought out of the field to burn off. Then, lime cavities should be buried with lime.
5. Strengthen cultivation management. According to the survey, the cultivation of high-riding ridges on the same plot is significantly lighter than that in low-ridge cultivation, and the disease is lightly covered with plastic membranes. Therefore, it is recommended that growers should grow on high ridges and cover them with plastic films. Do not flood irrigation, conditions can be drip irrigation to keep the soil semi-dry state, timely increase in phosphorus and potassium fertilizers to enhance resistance to disease.
6. Chemical control. (1) Immerse the roots with 900 times liquid of anti-Kangling wettable powder or 300 times liquid of hymexazide wettable powder for 10 to 15 minutes during colonization. (2) After planting the seedlings, the rooting agent should be strengthened by 800 times the wettable powder of Xiangnong 4 before the onset of disease, and the roots of the peppers should be irrigated every 7 to 10 days for 3 to 4 consecutive times. (3) When watering after planting, add copper sulphate into the field with water. The dosage per acre is 1.5-2 kg, which can reduce the incidence. (4) Spraying or irrigating with an agent at the early stage of the disease, such as 50% carbendazim WP 500 times, 50% thiophanate-methyl WP 500 times, 75% dexcone WP 800 times, etc. Mu spray liquid 50 liters, sprayed about 10 days 1 time, continuous spray 2 to 3 times, 3 days before fruit picking to stop the medication.